Since you added the epic ornament quest which takes every person in the game straight by this weak little trigger mob, he is IMPOSSIBLE to find. He probably gets 1 shot within 2 minutes of spawning by the super high amount of traffic going through this tunnel now. Please make him only have the 7 day spawn time IF he is handed the phylactery by a paladin and actually triggers Miragul. For heaven's sake restore my sanity. This wasn't well thought out at all.
This has been changed for the next full patch we do. He should no longer be attackable in his lich form. (The living version of Miragul that spawns after you give his lich the phylactery will still function as expected.)