Multiattack. The scion makes one Ice Axe and two Slam attacks, or it makes two Glacier Throw attacks.

Ice Axe. Melee Weapon Attack: +17 to hit, reach 30 ft., one target. Hit: 36 (4d12 + 10) force damage plus 18 (4d8) cold damage.

Slam. Melee Weapon Attack: +17 to hit, reach 20 ft., one target. Hit: 32 (4d10 + 10) force damage.

Glacier Throw. Ranged Weapon Attack: +17 to hit, range 120/480 ft., one target. Hit: 36 (4d12 + 10) bludgeoning damage plus 14 (4d6) cold damage, and the target must succeed on a DC 25 Strength saving throw or have the prone condition.

Glacial Upheaval (Recharge 5–6). The scion digs its hands into the ground at a point it can see within 30 feet of itself and launches a magically conjured mass of ice into the air. Each creature other than the scion in a 30-foot-radius, 100-foot-high cylinder centered on that point must make a DC 25 Dexterity saving throw. On a failed save, a creature takes 36 (8d8) bludgeoning damage plus 19 (3d12) cold damage and is pushed vertically to the top of the cylinder, at which point the creature falls. On a successful save, a creature takes half as much damage and is pushed to the nearest unoccupied space outside the cylinder with no additional effects. At the start of the scion's next turn, a mass of ice plummets to the ground on a point the scion can see within 60 feet of the point the scion dug its hands into. Each creature in a 30-foot-radius, 100-foot-high cylinder centered on that point must succeed on a DC 25 Dexterity saving throw or take 18 (4d8) bludgeoning damage plus 18 (4d8) cold damage.

Earth-Shaking Movement. The scion moves up to its speed and sends a shock wave through the ground in a 60-foot-radius circle centered on itself. Each creature on the ground in that area that is concentrating must succeed on a DC 25 Constitution saving throw or lose concentration.