Rockbreaker (ロックブレイカー, Rokku Bureikā?) is a Level 2 Command Style exclusive to Terra in Kingdom Hearts Birth by Sleep. It is activated by using mine-related or edge-related Deck Commands, jumping attacks like Quick Blitz, or commands like Brutal Blast, Geo Impact, Quake, and Meteor while in a LV1 Command Style.
While using Rockbreaker, Terra's attacks are more powerful, utilizing jumping attacks and swipes as his Keyblade drags and smashes against the ground, kicking up dirt along the way. The standard four-hit combo sprays rock debris upon enemies, with direct hits dealing 120% damage and the rock debris dealing 150% damage. The combo finisher consists of Terra flipping in the air and jamming his Keyblade into the ground, causing a piece of earth to jut up from the ground, the attacks can also inflict Confuse on enemies also dealing 250% damage. The finisher consists of Terra summoning three large boulders from the ground and sending them to damage enemies, any hit from the Keyblade or boulders will deal 600% damage.