I tried to follow the kosumoth game which i completed for the underwater mount, i failed cause the only runes came to my mind were the little clickable purple runes(Dark Rune) at illidari stand around demons in azsuna, all look the same so whatever...and they did nothing, even when i had world quest there, or i just dont remember ever using those runes for anything, bug or whatever, worth to mention that there is the zone "soul engine: apocalypse", i know someone just said the weapon apocalypse might has something to do with a spell wowhead. com/icon=1140312/inv-sword-2h-artifactsoulrend-d-05" ... soulrend.. or its just the name of the icon ...