Chilling. A creature that touches the elemental or hits it with a melee attack while within 5 feet of it takes 3 (1d6) cold damage, and if the creature doesn't have resistance or immunity to cold damage, it has disadvantage on the next weapon attack roll it makes before the end of its next turn.
Ice Glide. The elemental can burrow through ice and snow using a special burrowing speed of 15 feet. While doing so, the elemental doesn't disturb the material it moves through.
Dual Nature. The elemental counts as an elemental of both the water and air sub-types (primary water).
Multiattack. The elemental makes two Slam attacks.
Slam. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 13 (2d8 + 4) bludgeoning damage plus 3 (1d6) cold damage.
Ice Breath (Recharge 4–6). The elemental releases a blast of freezing ice and snow in a 30-foot cone. Each creature in the area must make a DC 15 Constitution saving throw. On a failed save, a creature takes 18 (4d8) cold damage and its speed is reduced by 20 feet until the end of its next turn.
Description
An ice elemental, composed of water and air, appears as a large chunk of jagged ice often formed into a vaguely humanoid shape. It floats through icy water in frosted landscapes or rests inside tranquil snowbanks, creaking as it moves its frozen body.
Anything that touches an ice elemental is magically chilled by an icy cold that seeps into the bones. They are also capable of expelling a frigid blast of icy wind from small cracks in their bodies. Ice elementals are wary of fire, and screech like dry ice when burned.
Ice elementals are native to the border plane between water and air, the Plane of Ice, also known as the Frostfell. There they swim about the frigid waters or climb the spires of floating ice into the cold windy sky.
Hybrid Elementals
The elemental planes of water, earth, fire, and air align on planar borders where two elements combine to form a new dual-element, such as earth and fire creating lava. These border zones give rise to new hybrid elementals made of the combined element.
This is a good stat block for an Ice Elemental. Not sure why there isn't one included in the MM already.
Perhaps a detail should be added for what happens if you save against the Ice Breath ability. Maybe half damage and no speed reduction.
Thanks! In fact, that particular detail is already going into the updated version that'll be in the full 246 page compendium, which releases entirely for free this week :)
It's got other hybrid elementals, like lightning elementals, fog elementals, lava elementals, etc. Plus a bunch of other stuff!
This is great timing! Been working on a Frost sword that contains one of these. Frost myrmidon anyone? Kind of like a vestige and frostmourne had a baby