it's kinda hard to kill them on the spot... i was level 7/8 too.. hmm... i tried 3-4 times.. fedup either one of my character died or my only spellcaster kicked the bucket... well i guess party composition also play an important role...well.. if u can kill him there and then.. by all means.. but if u can't try drawing em out.. it works for me.. but i couldn't get the drop from them.. i think it's needed by antone to create a weapon??
anyone knows where oaks appear again?