Me too quan.
I never find the proc.
But i like wild amu more than fang amu anyday.
Imo Wild is better amu for any class than their doom or lunar.
Thats why when my rogue was level one and i had golds i bought wild talisman.
I was so excited to buy every level 41 gears at very early stage. There were only one wild potency amu (normal gems) in auc and i bought it for 700k -.-

Needless to say i was too stupid i couldn't wait to buy that at cheaper price and can wait to get 41 and actually use it