The Black Iron Golem has two spells. One is Crushing Kill, which deals 999 damage and costs 65 Red Mana. The other is Breathe Poison, which costs 15 Green Mana, deals 3 points of damage per turn, and lasts 100 turns. It also has a weapon, called Great Iron Fist. It costs 30 Action Points, and deals 75 damage. It also ignores the enemy's defence.
In order to counter these powerful attacks, you receive the two-handed weapon Molten Metal, which costs 99 Action Points and deals 9999 damage.