Bone Golem

The spider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

The golem can't be affected or detected by spells of 1st level or lower unless it wishes to be. It has advantage on saving throws against all other spells and magical effects.

The golem makes five attacks with its Bone Spur Strike, each of which it may replace with its Osseous Grasp or Creeping Bone, if available.

Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 10 (2d6 + 3) piercing damage.

The golem leaps up to 20 feet and may move into the space of any Medium or smaller creature. Each creature whose space the golem lands in must succeed on a DC 14 Dexterity saving throw or be grappled (escape DC 14).

Each creature grappled by the golem must succeed on a DC 14 Constitution saving throw or gain 11 (2d10) cumulative temporary hit points as plates of bone begin to grow over its skin.

While a creature has any of these temporary hit points, it is restrained. While a creature has 30 or more of these temporary hit points, it is petrified.

When the golem takes 20 or more damage from a single source, it can make an attack with its Bone Spur Strike, afterwards making one fewer attack whenever it uses its multiattack.