The Crusher is typically black with a dark brown or gold tint to its body. They have been seen in various sizes, but are always considerably larger than common Soldier, standing around 10' tall when on all fours.
The Crusher's head is topped with a thick, bony crest, larger even than on some Queens, that it lowers into a vertical position before charging its target like a bull.
This crest is incredibly strong, hardy enough to repel most forms of gunfire (including even the M56 Smartgun), and when lowered into the charging position it effectively shields the Crusher's more vulnerable body from frontal damage.
The force that the Crusher can impart with its charging attack is tremendous, enough even to propel an M577 APC sideways some distance, or throw an individual Marine several meters through the air.