Originally Posted by
chumpy
In order to gain credit for 1 soul (1 mob) you need to deal damage to it while equipping Shadowmourne (epic). However, you do not need to deal melee damage with the axe, you just have to deal damage to gain credit.
Some may think this 2nd nature, but you can collect souls from the Rep-less mobs that fight the npcs at Icecrown Citadel entrance. The 1-3 npcs that charge npcs, solong as you have done a single damage to them they will reward you 1 soul.
I've currently set myself up to shoot a rough arrow at them with auto-it once they are in range and the NPCs have them tagged. Zero risk, farmable souls. Currently at 125/1000 from risk-free macroing what would normally be over 20 clears of Morrogar trash! Enjoy while it still works!