M.D.C.

This stands for 'Mega-Damage Capacity', which is the amount of damage a Mega-Damage object can absorb before breaking. Living creatures such as demons, dragons, and other inhuman beings may also have M.D.C.: it represents their physical resistance to Mega-Damage and makes them supremely powerful on Rifts Earth. All the M.D.C. of a living being must be reduced to zero before it fall into a coma and will die without regenerative powers or medical treatment.