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Graviturgy magic and other powerful forces can cause the local gravitational field to change significantly. The options below detail some of the possible changes that could occur.

Some regions have oversized plants and creatures compared to normal. Others cause humanoids, and perhaps other intelligent creatures, to shrink down to a fraction of their normal size. Relative to the party, the effects of both of these are the same.

In a region with abnormal sizes, all creatures and objects that are oversized (from the party's perspective) are tripled in size. All distances are tripled, all oversized objects have double their normal hit points, and all oversized creatures receive the following statistical changes:

This trap requires a spellcaster to carve a specific sequence of Abyssal runes into a doorframe using demon blood and diamond dust. The person who carves the runes chooses a passphrase in Abyssal. When the passphrase is spoken aloud (whispering counts) within 15 feet of the door, the trap is rendered inert for 1 minute.

When the final rune is carved, the sequence fades into the doorframe. The runes can be spotted with a DC 15 Wisdom (Perception) check, but a character can feel the runes if it runs its hand along the frame and succeeds on a DC 10 Intelligence (Investigation) check. A character who knows Abyssal can determine the passphrase with a DC 15 Intelligence check, though sometimes the passphrase is more difficult to discover and a clever carver may hide it in a riddle within the runes. Dealing 50 damage to the door's frame renders the trap inert until it is repaired. The AC for the doorframe depends on the material of which it is made (wood AC 15, stone AC 17, metal AC 19).

Any non-fiend creature who walks through the door triggers the trap. The creature is transported into a random area of the Abyss and witnesses unspeakable horror. That creature must make a DC 15 Wisdom saving throw. On a failed save it takes 55 (10d10) psychic damage. On a success it takes half damage. The creature returns on the side of the doorframe from which it entered at the end of its next turn.

This trap requires a spellcaster to carve a specific sequence of Abyssal runes into a doorframe using demon blood and diamond dust. The person who carves the runes chooses a passphrase in Abyssal. When the passphrase is spoken aloud (whispering counts) within 15 feet of the door, the trap is rendered inert for 1 minute.

When the final rune is carved, the sequence fades into the doorframe. The runes can be spotted with a DC 15 Wisdom (Perception) check, but a character can feel the runes if it runs its hand along the frame and succeeds on a DC 10 Intelligence (Investigation) check. A character who knows Abyssal can determine the passphrase with a DC 15 Intelligence check, though sometimes the passphrase is more difficult to discover and a clever carver may hide it in a riddle within the runes. Dealing 50 damage to the door's frame renders the trap inert until it is repaired. The AC for the doorframe depends on the material of which it is made (wood AC 15, stone AC 17, metal AC 19).

Any non-fiend creature who walks through the door triggers the trap. The creature is transported into a random area of the Abyss and witnesses unspeakable horror. That creature must make a DC 15 Wisdom saving throw. On a failed save it takes 55 (10d10) psychic damage. On a success it takes half damage. The creature returns on the side of the doorframe from which it entered at the end of its next turn.

Suspended above a 10-foot-square of thin stone ceiling is an acid-filled container. Any weight of more than 20 pounds placed on a hidden pressure plate in the floor beneath this area triggers the trap. The pressure plate can be spotted with a DC 15 Wisdom (Perception) check. A character studying the area can determine the pressure plate is a slightly different color than the rest of the floor with a DC 15 Intelligence (Investigation) check. Wedging an iron spike or other object under the pressure plate prevents the trap from activating.

When the trap is triggered the container holding the acid opens, pouring it onto the ceiling. Immediately stone and acid fall upon any creatures standing beneath. Creatures in the area must make a DC 15 Dexterity saving throw. Creatures who fail take 11 (2d10) acid and 11 (2d10) bludgeoning damage. Creatures who succeed take half damage.

Atop a shrine rests a copper bowl filled with gemstones.

Spoiled potions, broken magic items, or runoff from magical workshops can pollute waterways, creating a sludge called arcane effluence. While many Low Netherese individuals recognize the effluence's peculiar violet sheen, careless High Netherese mages usually don't even know such pollution exists.

One patch of arcane effluence covers a 5-foot square, and creatures within 30 feet of it can smell its acrid, unnatural scent. A creature that comes into contact with arcane effluence takes 3 (1d6) Acid damage. The creature takes the damage again at the start of each of its turns until the effluence is scraped off (requiring an action) or destroyed.

The Dispel Magic spell or a similar effect destroys arcane effluence.

The following rules can be used for rockslides as well as avalanches.

An avalanche is a mass of snow and debris falling rapidly down a mountainside. A typical avalanche is 300 feet wide, 150 feet long, and 30 feet thick. Creatures in the path of an avalanche can avoid it or escape it if they're close to its edge, but outrunning one is almost impossible.

When an avalanche occurs, all nearby creatures must roll initiative. Twice each round, on initiative counts 10 and 0, the avalanche travels 300 feet until it can travel no more. When an avalanche moves, any creature in its space moves along with it and falls prone, and the creature must make a DC 15 Strength saving throw, taking 1d10 bludgeoning damage on a failed save, or half as much damage on a successful one.

When an avalanche stops, the snow settles and buries creatures in it. A creature buried in this way is blinded and restrained and has total cover. The creature gains one level of exhaustion for every 5 minutes it spends buried in the snow. It can try to dig itself free as an action, breaking the surface and ending the blinded and restrained conditions on itself with a successful DC 15 Strength (Athletics) check. A creature that fails this check three times can't attempt to dig itself out again.

A creature that is not restrained or incapacitated can spend 1 minute freeing another creature buried in the snow. Once free, that creature is no longer blinded or restrained by the avalanche.

A typical avalanche (or rockslide) is 300 feet wide, 150 feet long, and 30 feet thick. Creatures in the path of an avalanche can avoid it or escape it if they're close to its edge, but outrunning one is almost impossible.

When an avalanche occurs, all nearby creatures must roll initiative. Twice each round, on initiative counts 10 and 0, the avalanche travels 300 feet until it can travel no more. When an avalanche moves, any creature in its space moves along with it and falls prone, and the creature must make a DC 15 Strength saving throw, taking 1d10 bludgeoning damage on a failed save, or half as much damage on a successful one.

When an avalanche stops, the snow and other debris settle and bury creatures. A creature buried in this way is blinded and restrained, and it has total cover. The creature gains 1 level of exhaustion for every 5 minutes it spends buried. It can try to dig itself free as an action, breaking the surface and ending the blinded and restrained conditions on itself with a successful DC 15 Strength (Athletics) check. A creature that fails this check three times can't attempt to dig itself out again.

A creature that is not restrained or incapacitated can spend 1 minute freeing a buried creature. Once free, that creature is no longer blinded or restrained by the avalanche.

These blue-tinted lilies expel a burst of toxic pollen whenever the lily patch is disturbed. The lilies have AC 17, 120 hit points, vulnerability to fire damage, and immunity to poison damage.

When disturbed, the lilies erupt in a 30-foot radius of pollen. Any creatures caught in this area must succeed on a DC 17 Wisdom saving throw or take 42 (12d6) psychic damage as the pollen causes wracking headaches and jolts of pain. Furthermore, any creature failing its Wisdom saving throw is confused as per the confusion spell for 1 minute. The creature can attempt a new saving throw at the end of each of its turns to end this effect. A creature that succeeds on its saving throw takes half damage and is not confused.

A DC 17 Intelligence (Nature) or Wisdom (Survival) ability check is necessary to spot the danger the azure lilies pose as well as to successfully harvest the pollen without triggering the hazard. Regardless of whether or not the hazard is triggered or the pollen is harvested, the pollen regrows and is ready to use again given 1 month. The only way to stop this from happening is to destroy the azure lilies by reducing them to 0 hit points.

The most obvious way to cross the room is to walk along the beam. But there's a hidden danger: a pressure plate beneath the beam's closest end causes the metal walls to emit a strong magnetic field.

This is one of several ballistae that augment the defenses of King Irovetti's Palace in Pitax. If the alarm is raised while the PCs approach the palace, guards ready and load the ballista firing on any targets within range on their initiative. With a team of at least three guards attending the ballista, the weapon can be reloaded and fired each round.

There are four guards stationed at the ballista. If two or more of the guards are made to leave their post or are incapacitated or killed, the efficiency of the ballista is compromised. At least three guards are needed to maintain its optimal firing rate. If only two guards attend the ballista, they must spend an action to reload and aim, allowing the weapon to fire only every other round. If only a single guard attends the weapon, they must spend an action to reload, another to aim, and one to fire, allowing a shot only once every 3 rounds.

Mechanical Trap (level 5-10, dangerous threat)

The big sister of the Crossbow Trap. Typically, ballistae are used to attack or defend castles, so anyone placing one indoors is either expecting serious trouble, or is wildly eccentric. Since a ballista is much harder to conceal than a crossbow, this trap is usually hidden behind a door, and can often shoot straight through it.

Trigger. A creature that opens a trapped door triggers the trap.

Effect. The trap makes an attack against the triggering creature. The attack has a +8 attack bonus and deals 16 (3d10) piercing damage on a hit. This attack can't gain advantage or disadvantage.

Countermeasures. A successful DC 15 Wisdom (Perception) check reveals a mechanism attached to the door. A successful DC 15 Desxterity check using thieves tools disables the trip wire, and a check with a total of 5 or lower triggers the trap.

This trap hurls several javelins to a range of 50 feet.

A bear trap resembles a set of iron jaws that springs shut when stepped on, clamping down on a creature's leg. The trap is spiked in the ground, leaving the victim immobilized.

Bile lichen is a toxic, green-yellow substance resembling vomit. It flourishes where extreme heat and cold mingle, such as at the steam-vent openings to Icewind Dale's Underdark. One patch of bile lichen covers a 5-foot square.

If a patch of bile lichen is touched, it releases a cloud of spores that fills a 10-foot Cube and dissipates after 1d4 hours. When a creature enters the cloud for the first time on a turn or starts its turn there, the creature makes a DC 14 Constitution saving throw, taking 11 (2d10) Poison damage and contracting Lichen Plague on a failed save (see "Magical Contagions" later in this chapter). On a successful save, the creature takes half as much damage only.

Hard, mineral-laced mounds jut from the surface, thrumming with energy.

On activation, a cyst generates a 5 foot wide line of lightning between itself and another cyst within 100 feet of it. Each creature in the line must make a DC 16 Dexterity saving throw, taking 28 (8d6) lightning damage on a failed save, or half as much damage on a successful one.

Alternatively, the cyst explodes with fire on activation. Each creature within 20 feet of the cyst must make a DC 16 Dexterity saving throw, taking 28 (8d6) fire damage on a failed save, or half as much damage on a successful one.

A bioenergy cyst is Medium, has 40 hit points, and has an AC of 13. Once activated, a bioenergy cyst cannot be activated again until it is regenerated and is not missing any hit points. Regenerating a bioenergy cyst causes it to regain 10 hit points.

All worldskin features are immune to poison, psychic, and radiant damage. They each have a Constitution score equal to their AC, they automatically fail Strength and Dexterity saving throws, and they are immune to effects that require Intelligence, Wisdom, or Charisma saves.

Still air with a lethal absence of oxygen and an abundance of harmful gases, blackdamp has claimed many a miner. Creatures that pass through an extended area must hold their breath or begin to suffocate. Additionally, those that breathe in this foul air must make a DC 12 Constitution saving throw at the start of their turn or take 2d6 poison damage. After three failures, a creature is poisoned for 1 hour.

The blizzards that ravage Icewind Dale and harry travelers on the mountain pass are reflections of Auril's self-imposed isolation. A blizzard in Icewind Dale typically lasts 2d4 hours, and whenever the characters are caught in one, the following rules apply until it ends.

A blizzard's howling wind limits hearing to a range of 100 feet and imposes disadvantage on ranged weapon attack rolls. It also imposes disadvantage on Wisdom (Perception) checks that rely on hearing. The wind extinguishes open flames, disperses fog, erases tracks in the snow, and makes flying by nonmagical means nearly impossible. A creature falls at the end of its turn if it is flying by nonmagical means and can't hover.

Visibility in a blizzard is reduced to 30 feet. Creatures without goggles or other eye protection have disadvantage on Wisdom (Perception) checks that rely on sight due to blowing snow.

Any creature that is concentrating on a spell in a blizzard must succeed on a DC 10 Constitution saving throw at the end of its turn or lose its concentration on the spell unless the creature is sheltered against the elements (for example, in an igloo).

A peculiar mushroom capable of inflating itself to ward off predators. Its typical resting state resembles a cluster of dirty white spheres on a white stalk. Sprouting in all kinds of environments, Bloomers aren't especially dangerous by themselves, their sudden and startling inflation being more than enough to deter most ordinary threats, unless they happen to grow near cliffs where they can push people off.

Normally the mushroom occupies a 5ft cube. When a creature moves within 5ft of the Bloomer, it rapidly inflates to occupy a 15ft cube. Creatures are pushed into the nearest unoccupied space, unless there are no available spaces, in which case it remains where it is and is restrained under the bulk of fungal balloons. If the Bloomer dies it rapidly but harmlessly deflates, but if it takes slashing or piercing damage it bursts in a powerful blast or air. Creatures within 5ft of the Bloomer must make a DC 10 Strength saving throw or be pushed 5ft away from the Bloomer and be knocked prone. A Bloomer has an AC of 7, 5 hitpoints, is resistant to bludgeoning damage, and immune to psychic damage. Identifying a Bloomer requires a DC 10 Intelligence (Nature) or Wisdom (Survival) check.

A sudden change in wind direction has the power to shift the sands of a dune, sculpting a hollow cavity at its core, and covering it with a thin and weak layer of sand. This natural trap is known as a 'blowout,' a treacherous pitfall lurking beneath a fragile crust of sand. To the unsuspecting eye, the surface appears undisturbed. When a character places even the slightest weight upon the surface, the frail layer of sand gives way, causing the victim to plummet into the pit below. This sudden displacement acts as a catalyst, triggering all the sand to fall alongside the victim like an avalanche. Within moments, the creature finds themselves swallowed and entombed in a sandy grave.

To determine who in the party is affected by the blowout and the damage it causes, all creatures in the party must participate in a skill challenge. Each creature must make three checks: a Wisdom (Perception) check, either a Strength (Athletics) or Dexterity (Acrobatics) check, and a third skill check of their choice. Players must justify their choice for the third skill, which must be approved by the GM. The DC for these checks is 13. As an option, the GM may allow a relevant spell or class feature to substitute the third check, granting an automatic success on that check. For instance, a wizard could cast the spell Fly to automatically succeed in lieu of making the third skill check.

Haulers must also participate in the skill check challenge to avoid the blowout. However, Haulers can use the same skill for all three checks.

Creatures can sacrifice themselves to save their beasts of burden. A creature can turn one of their successes into a failure to turn one of the Hauler's failures into a success.

The creature is buried from the hip down and considered Restrained. It automatically frees itself after 1 minute. Any creature within 5 feet (including the victim) can spend an action to make a DC 20 Strength (Athletics) check to free it. Not counting the victim itself, the DC is reduced by 5 for each assisting creature.

A fully buried creature is Blinded, Restrained, Incapacitated, and unable to breathe. If conscious, they can hold their breath for a number of minutes equal to 1 + their Constitution modifier; otherwise, they immediately begin to suffocate. A fully buried creature is helpless and cannot dig themselves out unless they have special magic to do so.

To find a fully buried creature, others must succeed on a DC 15 Wisdom (Perception) or Intelligence (Investigation) check. Each check requires 1 minute of searching. Once located, the buried creature can be pulled out with another minute of effort or a single DC 20 Strength (Athletics) check to do so instantly. The DC to pull the creature out is reduced by 5 for each assisting creature. If no one is there to help a fully buried creature, the victim is doomed to die.

Whenever a Blowout is rolled as part of a Wasteland Hazard for a random encounter, assume that all creatures traveling on foot are within the area of the blowout—the hazard's dimensions can be as big as needed. Roll a d100 to determine when the blowout activates in relation to the encounter. On a roll of 01-50, the blowout occurs first, and the encounter happens shortly after or is triggered by the hazard, if possible. On a roll of 51-100, the blowout occurs midway through the encounter, affecting both groups.

A sudden change in wind direction has the power to shift the sands of a dune, sculpting a hollow cavity at its core, and covering it with a thin and weak layer of sand. This natural trap is known as a 'blowout,' a treacherous pitfall lurking beneath a fragile crust of sand. To the unsuspecting eye, the surface appears undisturbed. When a character places even the slightest weight upon the surface, the frail layer of sand gives way, causing the victim to plummet into the pit below. This sudden displacement acts as a catalyst, triggering all the sand to fall alongside the victim like an avalanche. Within moments, the creature finds themselves swallowed and entombed in a sandy grave.

To determine who in the party is affected by the blowout and the damage it causes, all creatures in the party must participate in a skill challenge. Each creature must make three checks: a Wisdom (Perception) check, either a Strength (Athletics) or Dexterity (Acrobatics) check, and a third skill check of their choice. Players must justify their choice for the third skill, which must be approved by the GM. The DC for these checks is 13. As an option, the GM may allow a relevant spell or class feature to substitute the third check, granting an automatic success on that check. For instance, a wizard could cast the spell Fly to automatically succeed in lieu of making the third skill check.

Haulers must also participate in the skill check challenge to avoid the blowout. However, Haulers can use the same skill for all three checks.

Creatures can sacrifice themselves to save their beasts of burden. A creature can turn one of their successes into a failure to turn one of the Hauler's failures into a success.

The creature is buried from the hip down and considered Restrained. It automatically frees itself after 1 minute. Any creature within 5 feet (including the victim) can spend an action to make a DC 20 Strength (Athletics) check to free it. Not counting the victim itself, the DC is reduced by 5 for each assisting creature.

A fully buried creature is Blinded, Restrained, Incapacitated, and unable to breathe. If conscious, they can hold their breath for a number of minutes equal to 1 + their Constitution modifier; otherwise, they immediately begin to suffocate. A fully buried creature is helpless and cannot dig themselves out unless they have special magic to do so.

To find a fully buried creature, others must succeed on a DC 15 Wisdom (Perception) or Intelligence (Investigation) check. Each check requires 1 minute of searching. Once located, the buried creature can be pulled out with another minute of effort or a single DC 20 Strength (Athletics) check to do so instantly. The DC to pull the creature out is reduced by 5 for each assisting creature. If no one is there to help a fully buried creature, the victim is doomed to die.

Whenever a Blowout is rolled as part of a Wasteland Hazard for a random encounter, assume that all creatures traveling on foot are within the area of the blowout—the hazard's dimensions can be as big as needed. Roll a d100 to determine when the blowout activates in relation to the encounter. On a roll of 01-50, the blowout occurs first, and the encounter happens shortly after or is triggered by the hazard, if possible. On a roll of 51-100, the blowout occurs midway through the encounter, affecting both groups.

Complex Trap

The faces carved into the wall exhale slithering tendrils of darkness that writhe and coil in the air. When a non-flying creature moves more than 10 feet into the area, the trap triggers, causing the stone faces to inhale and sap energy from those in the area. All creatures in the affected area must make a DC 14 Constitution saving throw, taking 11 (2d10) necrotic damage and becoming enfeebled on a failed save. While enfeebled, a creature deals half damage with weapon attacks that use Strength, and has disadvantage on Strength checks. The enfeeblement lasts until a creature finished a short or long rest, or until removed by greater restoration. On a successful saving throw, a creature takes half the amount of damage and is not enfeebled.

At the start of the next round, the stone faces exhale a despair-inducing breath. All creatures in the affected area must make a DC 14 Wisdom saving throw, taking 11 (2d10) psychic damage and becoming frightened until the end of their next turn on a failed save. A frightened creature must take the Dash action to move out of the area by the safest route it can see, unless there is nowhere for it to move. On a successful saving throw, a creature takes half the amount of damage and is not frightened.

The trap continues this cycle of inhaling and exhaling as long as a non-flying creature remains in the area, ceasing if there are no creatures in the area for 1 round. Then the trap resets itself after 1 minute.

The trap can be detected with a successful DC 15 Intelligence (Arcana) check and disarmed with a second successful check. A failed check triggers the trap. Detect magic reveals an aura of necromantic magic around the faces in the wall. A successful dispel magic (DC 15) cast on the faces destroys the trap. A single face has AC 17, 10 hit points, and is immune to poison and psychic damage. Completely blocking the mouths of all four faces or destroying all four faces disables the trap.