Multiattack

The steam golem makes two ax arm attacks, or one long axe attack.

Ax Arm

Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 22 (4d6 + 8) slashing damage.

Long Axe

Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 40 (5d12 + 8) slashing damage.

Steam Blast (Recharge 5-6)

A steam golem can release a blast of steam. The golem chooses whether to affect a 5-foot radius around itself or a 20-foot cube adjacent to itself. Creatures in the affected area take 38 (7d10) fire damage, or half damage with a successful DC 17 Constitution saving throw.