Magic Resistance. The vermlek has advantage on saving throws against spells and other magical effects.

Keen Smell. The vermlek has advantage on Wisdom (Perception) checks that rely on smell.

Multiattack. The vermlek makes two Bite attacks.

Bite. Melee Weapon Attack: 4 to hit, reach 5 ft., one target. Hit: 7 (1d10 + 2) piercing damage. If the target is a creature, it must succeed on a DC 12 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

Inhabit Body (Recharge 6). The vermlek crawls into an intact Medium or smaller Humanoid corpse within 5 feet of it, consuming the bulk of the victim’s skeleton and internal organs as it does so and cramming itself into the cavity. The vermlek gains 10 temporary hit points, which last until the vermlek abandons the corpse. While inhabiting the corpse, it doesn’t decompose, and the vermlek adopts the corpse’s size, can’t use its burrowing speed, and gains half cover. Its game statistics otherwise remain the same.

The inhabitation lasts until the vermlek uses Abandon Body or the vermlek ends it as a bonus action. When the inhabitation ends, the vermlek crawls out into an unoccupied space within 5 feet of the corpse.

Abandon Body. When the vermlek takes damage while it is inhabiting a corpse, the vermlek crawls out of the corpse it is inhabiting, devouring much of the body’s remaining flesh and regaining 10 hit points in the process. The corpse it leaves behind is little more than a husk.