The Stone Dragon Great Hammer had four skills that he didn't actually use properly, even though Logan had controlled the hammer while in the Golem's body.
The first skill is Stomp, which can provide additional damage up to four times; a crazy skill, even though the energy possessed by the user seems to be almost drained in only two to three uses.
The second skill is Rage-Spin, a circular movement usually practiced by Zeno, a circular motion that gives the user additional Constitution, making their body resistance better even though they are pretty close to the opponent.
The third skill is Dragon-Supremacy, which can convert stats from Dexterity to Strength and even multiply it twice. Although this skill also drains quite a lot of energy. Really, a skill that is suitable for a tank that doesn't require a lot of movement speed in battle.