chillfire destroyer

Trampling movement. If the elemental moves into the space of another creature the creature must make a dc 13 strength save or be pushed 10ft and knocked prone, on a successful save they are only pushed 5ft  

Half Fire Form. A creature that touches the elemental or hits it with a melee attack while within 5 ft. of it takes 5 (1d10) fire damage.

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

Multi attack. The elemental makes 2 freezing slam attacks.

Freezing slam. Melee Weapon Attack: +3 to hit, reach 10 ft., 1 target. Hit: 15 (2d12 + 3) [bludgeoning] damage plus 6 (1d12) cold damage.