Chandelure

Spectral Body.
Chandelure can move through creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.

Ghostly Flame.
Chandelure’s fire is not purely physical. It affects incorporeal and ethereal beings and ignores resistance to fire damage.

Shared Bond (1/day).
As a bonus action, Chandelure chooses one creature it can see within 30 feet. For 1 minute, that creature gains resistance to necrotic and fire damage. If the creature drops to 0 hit points, Chandelure takes 2d12 psychic damage.

Multiattack.
Chandelure makes two attacks: Fire Lash and Shadow Ball.

Fire Lash. Melee Spell Attack: +7 to hit, reach 10 ft., one target.
Hit: 14 (3d6 + 4) fire damage, and the target's next attack is made at disadvantage as spectral flames swirl around their limbs.

Shadow Ball. Ranged Spell Attack: +7 to hit, range 60 ft., one target.
Hit: 18 (4d6 + 4) necrotic damage. On a failed DC 15 Constitution saving throw, the target cannot regain hit points until the start of Chandelure’s next turn.

Inferno (Recharge 5–6).
Each creature of Chandelure’s choice in a 20-foot radius sphere centered on a point within 60 feet must make a DC 16 Dexterity saving throw. On a failed save, a creature takes 27 (6d8) fire damage and is ignited, taking 1d6 fire damage at the start of each turn for 1 minute (save ends at end of turn). On a success, they take half and are not ignited.

Bonus Action

Will-o'-Wisps (3/Day).
Chandelure summons 1d4 flickering ghost-lights that orbit it or a creature within 30 feet. Each light grants +1d4 temporary hit points to the target and floats for 1 minute.