Changes

'''Phase 2:''' A small, complex, tubular organ, the ossmodula secretes hormones that both affect the ossification of the skeleton and encourages the forming bone growths to absorb ceramic-based chemicals that are laced into the Marine's diet.{{Fn|1}}{{Fn|2a}}{{Fn|3}} This drastically alters the way a Space Marine's bones grow and develop. Two years after this implant is first put in the subject's long bones will have increased in size and strength (along with most other bones), and the rib cage will have been fused into a solid, bulletproof mass of interlocking plates.{{Fn|1}}{{Fn|2a}}{{Fn|3}} It is not clear how a Space Marine's (non-implanted) lungs operate without a rib cage that can expand and contract.

*Known mutations:

**[[Black Dragons]] have a mutated Ossmodula, resulting in bony growths on their foreheads, elbows, and/or forearms.