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

Shock Aura. Any creature that starts its turn within 15 feet of Zil'ifar suffers 14 (4d6) lightning damage.

Lightning Absorption. Whenever Zil'ifar is subjected to lightning damage, he takes no damage and instead regains a number of hit points equal to the lightning damage dealt.

Mind Like A Maze. Zil'ifar can maintain concentration on two different spells at the same time. In addition, he has advantage on saving throws to maintain concentration on spells, and cannot have his mind read against his will.

Mechanical Redundancies. If Zil'ifar is subjected to a critical hit, roll (1d6) The hit is changed to a normal hit on the result of a 5 or 6.

Just a Subtle Change. When Zil'ifar casts a spell that deals damage, he can change the spell’s damage to cold, fire, force, lightning, or thunder.

Magic Resistance. Zil'ifar has advantage on saving throws against spells and other magical effects.

Spellcasting. Zil'ifar is a 20th-level spellcaster. His spellcasting ability is Intelligence (spell save DC 27, +19 to hit with spell attacks). He has the following wizard spells prepared:

Cantrips (at will): chill touch, frostbite, infestation, ray of frost, toll the dead

1st level (at will): detect magic, magic missile, shield, thunderwave, unseen servant

2nd level (at will): blur, dust devil, ray of enfeeblement, Tasha's mind whip

3rd level (at will): counterspell, dispel magic, sending, slow, spirit shroud

4th level (at will): blight, Evard's black tentacles, sickening radiance

5th level (4 slots): cloudkill, enervation, immolation, synaptic static

6th level (3 slots): circle of death, disintegrate, true seeing

7th level (3 slots): Mordenkainen's sword, reverse gravity, teleport

8th level (2 slots): Abi-Dalzim's horrid wilting, illusory dragon, maze

9th level (2 slots): blade of disaster, time stop

Multiattack. Zil'ifar makes three attacks: one with his bite and two with his claws.

Bite. Melee Weapon Attack: +18 to hit, reach 15 ft., one target. Hit: 18 (2d8 + 9) piercing damage plus 14 (4d6) acid damage.

Claw. Melee Weapon Attack: +18 to hit, reach 10 ft., one target. Hit: 14 (2d4 + 9) slashing damage plus 14 (4d6) lightning damage.

Tail. Melee Weapon Attack: +18 to hit, reach 20 ft., one target. Hit: 16 (2d6 + 9) bludgeoning damage plus 14 (4d6) force damage.

Acid Breath (Recharge 5–6). Zil'ifar exhales acid in a 90-foot line that is 10 ft. wide. Each creature in that area must make a DC 26 Dexterity saving throw, taking 91 (26d6) acid damage on a failed save, or half as much damage on a successful one.

Frightful Presence. Each creature of Zil'ifar's choice that is within 120 feet of him and aware of him must succeed on a DC 23 Wisdom saving throw or become frightened 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. If a creature's saving throw is successful or the effect ends for it, the creature is immune to Zil'ifar's Frightful Presence for the next 24 hours.

Zil'ifar can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. Zil'ifar regains spent legendary actions at the start of his turn.

At-Will Spell. Zil'ifar casts one of his at-will spells.

Tail Attack. Zil'ifar makes a tail attack.

Deathstorm Array(Costs 2 Actions). Zil'ifar discharges the array of lightning projectors on his back that have taken the place of his wings. Each creature within 15 feet of him must succeed on a DC 25 Dexterity saving throw or take 18 (2d8 + 9) lightning damage and be knocked prone. Zil'ifar can then fly up to half his flying speed.

Recharge (Costs 3 Actions). Zil'ifar regains a spell slot of 4th level or lower.