Breccia is a rock formed from angular gravel and boulder-sized clasts cemented together in a matrix. The angular nature of the clasts indicates that they have not been transported very far from their source. There are several modes of formation for breccia. Some represent consolidated material accumulated on steep hill slopes or at the foot of cliffs. Cataclastic breccias are produced by the fragmentation of rocks during faulting. Volcanic breccias (agglomerates) comprise blocks of lava in an ash matrix and are the product of an explosive eruption. Hydrothermal breccias are formed when hydrothermal fluid fractures a rock mass. Impact breccias are formed when a meteor impacts the Earth's surface, fracturing rock at the site of the impact. The cement that binds the clasts in a breccia is generally one of either calcite, silica or iron oxide.

Breccia chose to recommend Humility as its character trait for the Little Rox.