Char Shadow

Amorphous. A Char Shadow can move through a space as narrow as 1 inch wide without squeezing.

Firelight. A Char Shadow sheds bright light in a 20 foot radius and dim light in an additional 20 foot radius.  It has disadvantage on Dexterity (Stealth) checks.

Hungry Blaze. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 9 (2d6 + 2) necrotic damage and 3 (1d6) fire damage, and the target's Strength score is reduced by 1d4. The target dies if this reduces its Strength to 0. Otherwise, the reduction lasts until the target finishes a short or long rest.

If a corporeal creature dies from this attack, a new Char Shadow rises from the corpse 1d4 hours later, while the corpse itself becomes a Blackened Skeleton or a Blister Zombie.

Smoking Stealth. As a bonus action, while in what would otherwise be dim light or darkness, the Char Shadow can suppress its Firelight ability until the end of its next turn or until it damages a creature, whichever comes first.