Crystal Amalgamate

Ice Walk. The amalgamate can move across and climb icy surfaces without needing to make an ability check. Additionally, difficult terrain comprised of ice or snow doesn't cost extra movement.

Shatter. When the amalgamate is reduced to 0 hit points, it shatters in an explosion of jagged ice. Each creature within 10 feet of it must make a DC 14 Dexterity saving throw, taking 14 (4d6) piercing damage and 18 (4d8) cold damage on a failed save, or half as much on a successful one.

Snow Sight. The amalgamate is able to see clearly through an area obscured by snow or ice.

Standing Leap. The amalgamate's long jump is up to 20 feet and its high jump is up to 15 feet, with or without a running start.

Sturdy. The amalgamate can fall safely from heights up to 60 feet, taking no damage or suffering any ill side effects.

Multiattack. The amalgamate makes two slam attacks.

Slam. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 22 (4d8 + 4) bludgeoning damage plus 9 (2d8) cold damage. 

Ice Glaze (Recharge 5-6). The amalgamate touches the ground, projecting a 30-foot long and 5-foot wide line of ice spikes from the ground. Each creature in that line must make a DC 14 Dexterity saving throw, taking 13 (3d8) piercing damage plus 13 (3d8) cold damage on a failed save, or half as much damage on a successful one. The area the glaze travels along becomes difficult terrain until the ice is melted.