Ultroloth
HP 221 (26d8 + 104)
Speed 30 ft., Fly 60 ft. (hover)
Skills Deception +9, Perception +7, Stealth +8
Resistances Cold, Fire, Lightning
Immunities Acid, Poison; Charmed, Frightened, Poisoned
Senses Truesight 120 ft., Passive Perception 17
Languages Abyssal, Infernal; telepathy 120 ft.
CR 13 (XP 10 000; PB +5)
Traits
Fiendish Restoration. If the ultroloth dies outside Gehenna, its body dissolves into ichor, and it gains a new body instantly, reviving with all its Hit Points somewhere in Gehenna.
Magic Resistance. The ultroloth has Advantage on saving throws against spells and other magical effects.
Actions
Multiattack. The ultroloth uses Hypnotic Gaze and makes two Mercurial Whip attacks.
Mercurial Whip. Melee Attack Roll: +9, reach 15 ft. Hit: 25 (6d6 + 4) Force damage, and the ultroloth can teleport the target up to 10 feet to an unoccupied space the ultroloth can see that isn't in the air.
Hypnotic Gaze. Wisdom Saving Throw: DC 17, each creature in a 30-foot Cone. Failure: 10 (3d6) Psychic damage, and the target has the Stunned condition until the start of the ultroloth's next turn. Success: The target is immune to this ultroloth's Hypnotic Gaze for 24 hours.
Spellcasting. The ultroloth casts one of the following spells, requiring no Material components and using Intelligence as the spellcasting ability (spell save DC 17):
At will: Alter Self, Clairvoyance, Detect Magic1/day each: Dimension Door, Fireball (level 5 version), Wall of Fire
Bonus actions
Fiendish Guile (Recharge 4–6). The ultroloth casts Dispel Magic, Invisibility (self only), Misty Step, or Suggestion, requiring no Material components and using the same spellcasting ability as Spellcasting.
