Ciel, the Avatar of Omnipotence

Immutable Form. Ciel is immune to any spell or effect that would alter her form.

Regeneration. Ciel regains 30 hit points at the start of her turn if she has at least 1 hit point.

Legendary Resistance (5/Day). If Ciel fails a saving throw, she can choose to succeed instead.

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

Unusual Nature. Ciel doesn’t require air, food, drink, or sleep.

Multiattack. Ciel makes two Lightning Spear attacks.

Lightning Spear. Melee Weapon Attack: +16 to hit, reach 5 ft., 1 target. Hit: 23 (2d10 + 13) piercing damage plus 15 (5d6) lightning damage. 

Lightning Strike. Ranged Spell Attack: +17 to hit, range 120 ft., up to 5 different targets. Hit: 24 (8d6) lightning damage.

Summon Storm (Once a Long or Short Rest). Ciel calls forth two Elder Tempest within one mile of her. They last for 24 hours, until they reach zero hit points, or until Ciel reaches 0 hit points. They obey her commands and go on her turn, directly after her. 

Teleport. Ciel teleports up to 30 feet into an unoccupied space she can see within range.

Ciel 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. Ciel regains spent legendary actions at the start of her turn.

Attack. Ciel makes a Lightning Spear attack.

Thundering Fury (Costs 2 Actions). Ciel makes a Lightning Strike Attack. 

Summon Servants (Costs 3 Actions). Up to five Air Elemental appear in unoccupied spaces within 60 feet of Ciel and remain until destroyed. Elemental's summoned in this way roll initiative and act in the next available turn. Ciel can have up to five elemental's summoned by this ability at a time.