A "joke" NPC.
The four bosses within the Vault of Archavon raid instance are (in order of patch appearance): Archavon the Stone Watcher, Emalon the Storm Watcher, Koralon the Flame Watcher, Toravon the Ice Watcher.
Earth, Wind, Fire, Water... and now Heart. "By your powers combined[...]"
"Post constructively or I'll press some different buttons next time." -- CM Daeleht (from the old WoW website, no source link)