Ah, yes. The darkest of nights and the reflection of a casting light. In Shadow lies the powers of stealth and silence, the ultimate tool for a secretive victory.
There is an important pair of fraternal twins. Possibly minor dieties, sorcerers, or maybe just an important pair of nobles. One is evil and one is good. The thing is, the one who looks evil at first glance is the good one, and vice versa.