monster

Kostchtchie

CR 25

Large Fiend (demon), Chaotic Evil

Reveal Stat Block

Armor Class

16 (natural armor)

Hit Points

243 (18d10 + 144)

Speed

40 ft.

str

+10

dex

con

int

wis

cha

Traits

Legendary Resistance (3/Day).If Kostchtchie fails a saving throw, he can choose to succeed instead.

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

Actions

Multiattack.Kostchtchie makes two melee attacks, only one of which can be a bite attack.

Bite.mw 18 to hit, reach 5 ft., one creature. ({@damage 1d6 + 10) piercing damage.

Matalotok (Warhammer).mw 18 to hit, reach 10 ft., one target. ({@damage 2d8 + 10) bludgeoning damage, or 21 (2d10 + 10) bludgeoning damage when used with two hands, and the weapon emits a burst of cold that deals 10 (3d6) cold damage to each creature within 30 feet of it.

Legendary Actions.The creature can take 3 legendary actions...

Attack.Kostchtchie makes one melee weapon attack.

Charge.Kostchtchie moves up to his speed.

Curse (Costs 2 Actions).Kostchtchie curses one creature he can see within 60 feet of him. The cursed creature gains vulnerability to all damage dealt by Kostchtchie until the end of Kostchtchie's next turn.

Kostchtchie

The demon lord Kostchtchie resembles a squat hill giant with short, bandy legs and a grossly shaped head.

Frost giants who forsake their gods and turn to demon worship can summon Kostchtchie with bloody offerings left on altars of hewn ice. If the demon lord chooses to answer the giants' call, he hunts and fights alongside them for a time, infecting the frost giants with savage madness and bloodlust before disappearing back to the Abyss.