This monster appears in the Dungeons & Dragons Player's Handbook 2024.
Traits
Amorphous Form (Air, Fire, and Water Only). The spirit can move through a space as narrow as 1 inch wide without it counting as Difficult Terrain.
Actions
Multiattack. The spirit makes a number of Slam attacks equal to half this spell’s level (round down).
Slam. Melee Attack Roll: Bonus equals your spell attack modifier, reach 5 ft. Hit: 1d10 + 4 + the spell’s level Bludgeoning (Earth only), Cold (Water only), Lightning (Air only), or Fire (Fire only) damage.