Hezrou

If the monster dies outside the Abyss, its body dissolves into ichor, and it gains a new body instantly, reviving with all its Hit Points somewhere in the Abyss.

The monster has Advantage on saving throws against spells and other magical effects.

Constitution Saving Throw: DC , any creature (other than a monster) that starts its turn in a -foot Emanation originating from the monster.
Failure: The target has the Poisoned condition until the start of its next turn.
Success: The target is immune to the Stench of all monster for 1 hour.

The monster makes three attacks.

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The monster jumps up to feet by .