Soulstinger Demon

Large Fiend (Demon), Lawful Evil

AC: 19

Initiative: +3 (13)

HP: 142 (15d10 + 60)

Speed: 40 ft., fly 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: Deception +7, Insight +6

Resistances: cold; bludgeoning, piercing, slashing from nonmagical attacks that aren't silvered

Immunities: fire; poison

Condition Immunities: poisoned

Senses: darkvision 120 ft., Passive Perception 12

Languages: Infernal, telepathy 120 ft.

CR: 9 (XP 5,000; PB +4)

Devil's Sight.

Magical darkness doesn't impede the demon's darkvision.

Magic Resistance.

The demon has advantage on saving throws against spells and other magical effects.

Actions

Multiattack.

The demon makes three attacks: two with its claws and one with its sting.

Claw.

Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 8 (1d8 + 4) slashing damage.

Sting.

Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 13 (2d8 + 4) piercing damage plus 17 (5d6) poison damage, and the target must succeed on a DC 14 Constitution saving throw or become poisoned for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Find this creature in the encounter builder

Source: Plane Shift: Amonkhet, p. 30 - Licenses and attribution