Levistus’s Gift (Recharges after a Long Rest).
When Kadroth drops below 15 hit points, he becomes temporarily possessed by Levistus. This lasts 2 rounds or until Kadroth drops to 0 HP.
Effects:
He immediately regains 20 temporary hit points.
His attacks deal an additional 1d8 cold damage.
His movement speed is halved, but he gains resistance to all damage except fire and radiant.
All creatures within 10 ft. of him at the start of his turn take 5 cold damage (no save) as frost forms over the ground.
His voice echoes unnaturally, and his eyes glow icy blue.
Dark One’s Blessing.
When Kadroth reduces a creature to 0 hit points, he gains 12 temporary hit points.
Innate Spellcasting (Tiefling).
At will: thaumaturgy
1/day each: hellish rebuke (2nd level), darkness
Actions
Multiattack.
Kadroth makes two Eldritch Blast attacks.
Eldritch Blast (Cantrip, +7 to hit).
Ranged Spell Attack: +7 to hit, range 120 ft., one target.
Hit: 9 (1d10 + 4) force damage.
Effect (Levistus’s Wrath): On hit, the target’s speed is reduced by 10 ft. until the end of Kadroth’s next turn.
Spellcasting (Warlock, Pact of the Tome, Spell Save DC 14, +6 to hit)
At-will: eldritch blast, minor illusion, frostbite, mage hand
2/day each (2 slots, 2nd level): armor of Agathys, mirror image, hold person, suggestion
Bonus Actions
Hex (Recharges on Short Rest).
Kadroth casts hex as a bonus action (concentration, up to 1 hour).