The second you came to Devildom and Mammon laid eyes on you, his greedy nature instantly took over. He always had the mentality that he would stop at nothing to get his hands on whatever he wanted once he decided that he wanted it. Your arrival put you at the top of his "must acquire" list. He became the first demon you made a pact with but he wont stop there. No, he's greedy and he wont stop till you are solely his. Mind, body and soul. He wants it all. With nothing left for his brothers.