Why should it be bugabuse?
Crying about clans that get extra items? Your clan could do the same.
Farm marbles, relog to x2 and kill that whore.
Basicly, the ones who saying its a bug, are the ones who are too weak killing Isiloon.
You put the effort to farm marbles (believe me, Servants dont drop marbles often) therefore you should be able to gain items from Isiloon.