Instance after instance, Blizzard introduces us to new and exciting bosses -- usually figures of high lore, that we'd previously considered undefeatable. Yesterday at E3 we were given a first preview of Zul'Aman, in which we've learned we'll also be killing a major figure of lore: Zul'jin. Zul'jin, a leader of Troll infamous for his raids against Quel'Thalas, will be the instance's final boss. So soon enough, yet another figure of lore will be permanently removed from the lore by virtue of a world first. On a practical note, I wonder if there will come a time when in-game instances contain all of the universe's major figures of lore and we'll be completely out of things to kill. But considering storyline, I wonder -- when we're powerful enough to kill bosses such as Kael'thas, Archimonde, and Illidan, what challenges could the rest of Warcraft lore pose for us? And does being able to kill them weaken the lore associated with them?