Cold-Flame Elemental

Cold-Flame Aura. At the end of each of the elemental’s turns, each creature in a 10-foot emanation originating from the elemental takes 5 (1d10) fire damage plus 5 (1d10) cold damage. Creatures and flammable objects in the emanation start burning.

Cold-Flame Form. The elemental can move through a space as narrow as 1 inch without expending extra movement to do so, and it can enter a creature’s space and stop there. The first time it enters a creature’s space on a turn, that creature takes 5 (1d10) fire damage plus 5 (1d10) cold damage.

Cold-Flame Ignition. If the elemental applies the burning condition to a creature or flammable object, the target also takes 1d4 cold damage. 

Illumination. The elemental sheds bright light in a 30-foot radius and dim light for an additional 30 feet.

Water Susceptibility. The elemental takes 3 (1d6) cold damage for every 5 feet the elemental moves in water or for every gallon of water splashed on it.

Multiattack. The elemental makes two attacks with either burn or bolt.

Burn. Melee Attack: +6 to hit, reach 5 ft, one target. Hit: 10 (2d6 + 3) fire damage plus 7 (2d6) cold damage. If the target is a creature or a flammable object, it starts burning.

Bolt. Ranged Attack: +6 to hit, range 10/120 ft, one target. Hit: 12 (2d8 + 3) fire damage plus 9 (2d8) cold damage. If the target is a creature or a flammable object, it starts burning.

Cold-Flame Burst (Recharge 5-6). The elemental releases a wave of cold-flame in a 20-foot radius centred on itself. Each creature in that area must make a DC 15 Dexterity saving throw. On a failed save, the target takes 16 (3d10) fire damage plus 16 (3d10) cold damage and starts burning. On a successful save, the target takes half as much damage only.