Nomi, The Adamantine Charge

A number of Nomi's attacks and traits create acid pools: 5-foot-radius circles of corrosive liquid that last for 1 hour. A creature that enters an acid pool for the first time on a turn or starts its turn there takes 25 (10d4) acid damage. A nonmagical object that is in a pool on initiative count 0 is destroyed.

Nomi can use an action to move through any object or magical barrier as though it were difficult terrain, destroying it in the process. In addition, they deal double damage to objects and structures, and their weapon attacks are considered magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.

Nomi is immune to any spell or effect that would alter their form or move them to another plane of existence against their will.

If Nomi fails a saving throw, they can choose to succeed instead.

If Nomi moves at least 20 feet straight toward a creature and then immediately hits it with an Adamantine Armblade attack, that target must succeed on a DC 22 Strength saving throw or be knocked prone. If the target is prone, Nomi can make one Stomp attack against it (no action required).

Nomi makes two Adamantine Armblade attacks.

Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 23 (3d10 + 7) slashing damage. This attack scores a critical hit on a roll of 19 or 20 and ignores the effects of adamantine armor.

Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 14 (2d6 + 7) piercing damage, and the creature is grappled (escape DC 22). Until the grapple ends, the creature is restrained, and Nomi can't target another creature with their Pincer attack.

Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 17 (4d4 + 7) bludgeoning damage.

Nomi throws one creature it is grappling with their pincer a number of feet equal to 2d6 × 10 in any direction. If the creature collides with an obstacle that prevents it from moving the full distance, it takes 24 (7d6) bludgeoning damage before falling down.

Nomi sprays a wave of acid from their abdomen in a 120-foot cone. Each creature in the area must make a DC 22 Dexterity saving throw, taking 50 (20d4) acid damage on a failure, or half as much damage on a success. Three Acid Pools appear centred on points of Nomi's choice in the area of the cone.

Nomi extends their insectoid wings and takes flight. Each creature within 30 feet of them must succeed on a DC 22 Strength saving throw or take 18 (4d8) bludgeoning damage and be knocked prone. Until the end of their next turn, Nomi gains a flying speed equal to their walking speed and their Wings vulnerable area is targetable.

Nomi twists and shakes their body violently. Each creature currently scaling them must succeed on a DC 15 Strength or Dexterity saving throw (creature's choice) or be thrown off, landing prone in the nearest unoccupied space.

Nomi makes one Pincer attack or uses their Toss.

Nomi lowers their head, picking a direction. Until the end of the next hostile creature's turn, Nomi's Eyes vulnerable area is not targetable. At the end of the next hostile creature's turn, Nomi charges, moving in the chosen direction until they collide with a creature or obstacle, or move a distance equal to their walking speed. If Nomi collides with a creature's space, that creature must make a DC 22 Strength saving throw. On a failure, the creature takes 27 (5d10) bludgeoning damage and is knocked prone and grappled by Nomi (escape DC 22), who pins it down using one leg. While grappled in this way, the creature is restrained. If Nomi collides with a solid object, like a thick wall, they take 27 (5d10) bludgeoning damage and lose one unspent legendary action (regaining it as normal at the start of their next turn).

Nomi ends the grappled and restrained conditions on themself, gains a flying speed equal to their walking speed until the end of this turn, and can immediately fly up to that speed. This movement doesn't provoke opportunity attacks. Until the end of Nomi's next turn, their Wings vulnerable area is targetable.