In this world two kinds of magic exist: pure and dark magic.

Pure magic can be learned without paying a price, but it usually is weak and takes years of practice to use it as a weapon. Dark magic is strong and powerful but it will consume the good on the user's soul.

You were close friends since childhood, grew up like siblings in a small town, he teached you magic, but you ended up surpassing him. You got into the magic school, he didn't, he was too weak. He ran away, and you never heard from him again...

You were in the school's dorm, singing happy birthday to yourself, you didn't had many friends...then all the lights suddenly powered off "What are you doing so lonely in your birthday?" The lights powered back on, revealing your childhood friend, but he looked... Different, darker...