When Crit by a melee weapon, it gets stuck in Angvor's sticky blood (DC14 STR save to pull free). Taking magical Fire or Radiant damage suppresses this until the start of Angvor's next Turn.
Advantage VS damaged creatures.
When Angvor has a Creature in his stomach, they take 1d10 Acid damage on each of his Turns (can't miss or crit). If a Creature dies in his stomach, their soul is sent to Yeenoghu, and they can't be resurrected by anything short of Redeem.
- •Ravage.
Move 6, the 2d10. On damage: Grappled (Escape DC14).
- •Devour.
(Grappled target) 1d10, Restrained inside Angvor's stomach (max 1 Creature, DC14 Might check to escape). When Crit: Regurgitate the Restrained target.
- •Yeenoghu's Curse (1 use).
(Reach 10, AoE) DC14 WIL save or 3d10+10 Psychic damage and Poisoned (magical healing ends). Half damage only on save.
Yeenoghu's Curse recharges. When Crit by a melee weapon, the attacker is Grappled by Angvor's sticky blood (Escape DC14).
Angvor's nearly down but his regeneration is going haywire! 80 more damage and dies. Until then, only magical Fire or Radiant damage can kill him, but Crits can still whittle him down.
An homage to that inspired the return of a troll from one of my players' Hero's backstory.
"Once upon a time, when an awakened Gnoll named Kivah was seeking refuge northward, her clan encountered a group of trolls in the Troll Hills while fleeing from her unawakened kin. All but one troll was defeated with fire, and the pursuing Gnolls ended up feasting on the last troll, Angvor, whose regeneration meant he could not die. Over the course of days, he was driven mad by the time he defeated all of the Gnolls and consumed their flesh. Angvor's regeneration reacted with the Abyssal taint of Yeenoghu's curse and turned him into a pawn of the Demon Lord of Savagery, cursed with the same never-ending hunger as the Gnolls. The curse also caused him to acquire some Gnoll-like features, such as a mane of spiky, matted hair down his neck and back, and a large, gaping maw of a mouth, ready to consume anything and everything in sight..."