Large fiend (sidikur), any evil

Armor Class: 19 (natural armor)

Hit Points: 142 (15d10 + 60) 13d10+60

Speed: 40 ft

STR

18 +4

DEX

16 +3

CON

18 +4

INT

13 +1

WIS

14 +2

CHA

16 +3

Saving Throws: Int +5, Wis +6, Cha +7

Skills: Perception +6

Damage Resistances: acid, necrotic; bludgeoning, piercing, and slashing from nonmagical attacks that aren't silvered

Damage Immunities: poison

Condition Immunities: poisoned

Senses: darkvision 120 ft., passive Perception 16

Languages: Infernal, telepathy 120 ft.

Challenge Rating: 9

Soulflayer by Seb McKinnon

Actions

Multiattack. The soulflayer makes three attacks: two with its longsword and one with its polearm.   Longsword. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 8 (1d8 + 4) slashing damage.   Hooked Polearm. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 17 (2d12 + 4) piercing damage. If the target is a Huge or smaller creature, it is grappled (escape DC 14). Until this grapple ends, the soulflayer can't use its polearm on another target.   Soul Rend (Recharge 6). The soulflayer creates a vortex of life-draining energy in a 20-foot radius centered on itself. Each humanoid in that area must make a DC 15 Constitution saving throw, taking 33 (6d10) necrotic damage on a failed save, or half as much damage on a successful one. Increase the damage by 10 for each living humanoid with 0 hit points in that area.