Hey sorry but i gotta put this, feel free to shoot it down or whatever , and i dunno if someones came up with this or not but heres my theory on who killed asmodean..i think it was Luc/Isam
k here it goes, so in the 4th book Luc was hiding in the Tower of Genji cause Perrin was chasing him, which is Finnland right? so obviosuly he has some connection with the Finns if he can go there when he wants, and so maybe Luc and Isam somehow got melded together like that cause of something the Finn's did?, so when Lanfear got into Finnland throught the doorframe, she could have had one of her wish