"Martial: Martial powers are not magic in the traditional sense, although some martial powers stand well beyond the capabilities of ordinary mortals." - PHB page 54.
Classes that draw power from the martial power source are:
- barbarian (berserker subclass only, which is also primal)
- bard (skald subclass only, which is also arcane)
- ranger (also primal)
Martial powers are also called exploits.