Cinderspawn

Frostfire Shield. A creature that touches the cinderspawn or hits it with a melee attack while within 5 feet of it takes 5 (1d10) cold damage as the cinderspawn drains its body heat.

Illumination. The cinderspawn sheds bright light in a 10-foot radius and dim light for an additional 10 feet.

Water Susceptibility. For every 5 feet the cinderspawn moves in water, or for every gallon of water splashed on it, it takes 1 cold damage.

Warmth Drain: Living creatures hit by a cinderspawn’s touch attack must make a DC 18 Constitution save or take 1d6 points of cold damage. (Creatures with the fire subtype has disadvantage on the saving throw). When a cinderspawn drains a victim’s warmth it gains 5 temporary hit points, no matter how many points it drains. These temporary hit points last for up to 1 hour.

Multiattack. The cinderspawn makes two touch attacks. If both attacks hit the same target, the cinderspawn also gains 10 temporary hit points.

Touch. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 13 (3d6 + 3) cold damage.

Drain Heat (Recharge 6). The cinderspawn drains the heat of each creature within 15 feet of it. Each creature in that area must make a DC 14 Constitution saving throw, taking 27 (6d8) cold damage on a failed save, or half as much damage on a successful one. If the saving throw fails by 5 or more, a creature also suffers one level of exhaustion.

Sudden Rush. Until the end of the turn, the cinderspawn's speed increases by 60 feet and it doesn't provoke opportunity attacks.