Legendary Resistance (3/Day). If Corthidax fails a saving throw, he can choose to succeed instead.
Rejuvenation. when destroyed Corthidax gains a new body in 1d100+200 days, regaining all its hit points and becoming active again. The new body appears within the astral sea, but cant return by any means unless the brought back by other means.
Spellcasting. Corthidax is an 18th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 20, +12 to hit with spell attacks). The lich has the following Warlock, Cleric and Sorcerer spells prepared:
Cantrips (at will): eldritch blast, prestidigitation, chill touch
1st level (4 slots): detect magic, Arms of hadar, inflict wounds, thunderwave
2nd level (3 slots): acid arrow, detect thoughts, shatter, shadow blade
3rd level (3 slots): animate dead, counterspell, soul rend (Homebrew) (or fear, fireball
4th level (3 slots): blight, shadow of moil
5th level (3 slots): cloudkill, scrying
6th level (1 slot): harm, soul cage
7th level (1 slot): finger of death, forcecage
8th level (1 slot): dominate monster, maddening darkness
9th level (1 slot): imprisonment
Turn Resistance. Corthidax has advantage on saving throws against any effect that turns undead.
Magic Resistance. Corthidax has advantage on saving throws against spells and other magical effects.
Innate Spellcasting (Psionics). Corthidax’s innate spellcasting ability is Intelligence (spell save DC 20). It can innately cast the following spells, requiring no components.
At will: detect thoughts, levitate
1/day each: dominate monster, plane shift (self only)
Rotting Touch. Melee Spell Attack: +12 to hit, reach 5 ft., one creature. Hit: 10 (3d6) cold damage. The target must succeed on a DC 18 Constitution saving throw or take 1d6 necrotic damage at the beginning of their turn 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.
Tentacles. Melee Weapon Attack: +12 to hit, reach 5 ft., one creature. Hit: 21 (3d10 + 5) psychic damage. If the target is Large or smaller, it is grappled(escape DC 15) and must succeed on a DC 20 Intelligence saving throw or be stunned until this grapple ends.
Extract Soul. Melee Weapon Attack: +12 to hit, reach 5 ft., one incapacitated humanoid grappled by Corthidax. Hit: 55 (10d10) force damage. If this damage reduces the target to 0 hit points, the lich kills the target by extracting and devouring its brain.
Call fo the deep(Recharge 5–6). Corthidax magically emits horrifying moans in a 60-foot cone. Each creature in that area must succeed on a DC 18 Intelligence saving throw or be stunned for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Corthidax gains the following legendary action options, which replace all of Corthidax’s legendary actions.
Tentacles. Corthidax makes one attack with its tentacles.
Extract Soul (Costs 2 Actions). Corthidax uses Extract Soul.
Call of the deep (Costs 3 Actions). Corthidax recharges its Call of the deep and uses it.
Cast Spell (Costs 1–3 Actions). Corthidax uses a spell slot to cast a 1st-, 2nd-, or 3rd-level spell that it has prepared. Doing so costs 1 legendary action per level of the spell.
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