Lately I've been wondering. How come titans couldn't just kill off Old Gods and players could. I understand that the Old God were so huge during the events of shaping the Azeroth and they had to be imprisoned. Y'shaarj was simply ripped away from the grounds, but why they just couldn't simply kill them?
Players at the moment have killed few Old GOd without problems and the mighty Titans couldn't? I've searched internet for an answer and couldn't find one.