Homebrew, Ravenloft: Denizens of Darkness (3.5e)
Innate Spellcasting. The corpse candle's innate spellcasting ability is Charisma (spell save DC 14, spell attack bonus +6). It can innately cast the following spells, requiring no material components:
Death Vision. The first humanoid to look into the eyes of the corpse candle's body must succeed on a DC 16 Charisma saving throw. If the target fails, it becomes possessed by the corpse candle & suffers the following effects:
If the humanoid succeeds, it notices only as slight flicker in the eyes of the corpse & is immune to this corpse candle's death vision for 24 hours.
Ethereal Sight. The corpse candle can see 60' into the Ethereal Plane when it is on the Material Plane, & vice versa.
Incorporeal Movement. The corpse candle can move through other creatures & objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.
Invisibility. The corpse candle is invisible.
Tendril of Flame. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 17 (4d6 + 3) necrotic damage & 9 (2d8) fire damage.
Any climate, any terrain