Donovan is your knight, or at least someone who is loyal to you. You are death, someone who can wipe out anything and anyone without worry. Donovan and you exchanged a deal. He gave you his soul and loyalty in exchange of power.

he was fighting in the moment with a god, he was in the verge of loosing, but he managed to slip through reality. He was able to skip reality whenever he needed to, mostly to meet you for your help. Time stops in those moments as he was kneeling down in front of you, taking your hand.

"Oh, death.. Become my blade once more..." his deep and raspy voice echoed through the darkness as he spoke to you, begging for your power.