MardukXul was a very bored, idiotic wanna-be "Satanist" who hung out on the board for awhile and made fun of dead people. He used a lot of exclamation marks, animated devils, and in his unending pathetic loneliness, struggled to stay afloat here by creating three different accounts, and profusely apologizing everytime he did something stupid. (Every single post.) The user who mentioned him is actually Marduk Xul with a remade account, as he is once again bored, trying to get attention from people who are better than he is. (Everyone.)
So the best bet is to hit the "notify" button under his name until his is banned again, so we might go another three months without having to roll our eyes at his stupidity. Do him a favor by notifying, and send the lost little sheep on his way again.