Battle Lock

Take one sense away and the others are heightened...

Remove one's eyesight for example, and they can hear even the faintest of footsteps..

Remove one's arms, and they can run like the wind...

Remove one's ability to feel joy, and they will weep until their eyes run dry....

The idea that energy cannot be created nor destroyed is the prominent rule in this world, and restrictions to enable this, can be set by anyone.