Usualy, when you kill him, you're supposed to hear a commentator saying a lot of useless stuff but this time, nothing happens. I do have a lot of mods installed and I always had when I did this quest before and they never caused a problem. Maybe one of them that I didn't have before is causing all this, I don't know. I tried installing the Unofficial Patch for Oblivion and it didn't solve the problem.
I tried to use the setstage command to advance the quest and it didn't help. I also tried to teleport myself out of there and when I go talk to Ysabel, she says that I'm supposed to be in The Arena. I try to go there but the door is locked so I unlock it with the Unlock command and when I get there, I can see the Gray Prince lying on the floor dead where I killed him. I also tried to resurrect him and kill him again and it didn't change anything except the fact that I had a second Raiment of Valor. Oh and I still can't get out when I rentered the Arena after teleporting myself out of there.
I hope you guys can help me solve this problem and if any of you can find me some commands that I can use so I can finish the quest, have my Grand Champion title, have the name that goes with it (Shadowstep, Black Arrow, Skullcrusher, etc.) and so I can do the fights with animals and everything else that goes with it like people recognize me as the Grand champion and call me by the name I chose etc. If any of you can find me a way to make all this happen with commands or anything else, I would be totally happy.
Thank you very much!