Board Thread:Character Discussion/@comment-25355646-20150302022703/@comment-1894786-20150608055009

Simple physics. For every action, there must be an equal and opposite reaction. For matter there is antimatter. For good, there is evil. You can't have one without the other. Otherwise they can't exist.

Chances are Merlin couldn't practice light magic without creating the ultimate embodiment of dark; the Dark Curse. Either that or someone else made it.