Multiattack

Two Slams or one Slam and uses Preserve Creature.

Slam

Melee Weapon Attack: +8 to hit, 5 ft., one target, 15 (3d6+5) bludgeoning damage + 9 (2d8) cold. Target is grappled (escape DC 16) if it is a Med or smaller creature and golem doesn't have another creature grappled.

Preserve Creature

Preserves up to Med creature grappled by it: can't breathe restrained as it freezes. Restrained creature: DC 16 Con save at its next turn end. Fail: 18 (4d8) cold is petrified in Ice Cavity total cover from attacks/effects outside. If this damage reduces it to 0 hp creature automatically stable. Petrified creature removed from Cavity thaws ending petrification in 1d4 rounds or immediately after taking fire damage. Success: half damage and ejected landing prone in unoccupied space within 5 ft. of golem. If golem moves preserved creature moves with it. GCan have only one creature preserved at a time. Can't use Preserve Creature if Ice Cavity is frozen.