Multiattack

Two Slam attacks or three Astral Bolt attacks.

Slam

Melee Weapon Attack: +8 to hit, 5 ft., one target, 11 (2d6+4) bludgeoning damage + 18 (4d8) cold.

Astral Bolt

Ranged Spell Attack: +8 to hit, 120 ft., one target, 18 (4d6+4) radiant and the next attack roll made vs. the target before the end of the incandescent one's next turn has advantage.