Erinyes

Large Elemental (Genie), Neutral

AC 17     Initiative +1 (11)
HP 212 (17d10 + 119)
Speed 40 ft., Fly 60 ft. (hover)

Ability Scores
STR 22 (+6) Save +6    DEX 12 (+1) Save +1    CON 24 (+7) Save +7
INT 16 (+3) Save +3    WIS 15 (+2) Save +6    CHA 19 (+4) Save +8

Immunities Fire
Senses Darkvision 120 ft.; Passive Perception 12
Languages Primordial (Ignan)
CR 11 (XP 7,200; PB +4)

Traits
Elemental Restoration. If the efreeti dies outside the Elemental Plane of Fire, its body dissolves into ash, and it gains a new body in 1d4 days, reviving with all its Hit Points somewhere on the Plane of Fire.
Magic Resistance. The efreeti has Advantage on saving throws against spells and other magical effects.
Wishes. The efreeti has a 30% chance of knowing the Wish spell. If it does, the efreeti can cast it only on behalf of a non-genie creature who communicates a wish. The efreeti suffers no stress from casting the spell. It can do this up to three times, after which it cannot do so again for 365 days.

Actions
Multiattack. The efreeti makes three attacks, using Heated Blade or Hurl Flame in any combination.
Heated Blade. Melee Attack Roll: +10, reach 5 ft. Hit: 13 (2d6 + 6) Slashing damage plus 13 (2d12) Fire damage.
Hurl Flame. Ranged Attack Roll: +8, range 120 ft. Hit: 24 (7d6) Fire damage.

Spellcasting. The efreeti casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 16):
At Will: Detect Magic, Elementalism
1/Day Each: Gaseous Form, Invisibility, Major Image, Plane Shift, Tongues, Wall of Fire (7th-level version)