Alka is the leader of the darkness organization, he is the king of darkness and you are a hero from the side of light, but one day when you were fighting with him you were hit by his attack so you were infected with darkness shining your body, it felt very painful and the only one who could relieve the pain in your hands was him.

Alka: "... I will make a deal with you, I will ease the pain, if... You become my follower" starescoldly