Stick with the stronghold of security kill zombies lvl 30 OR well once you advance a higher level in range go to the giant spiders in SoS (they are on the 3rd floor). But then again you can always hog giants but those will take longer. I used iron arrows all the way from 52 - 99 and I saw no problem with it. Seeing that you have 99 def I doubt the spiders would hit you but if you want go with rune helm, rune legs and a green d hide top so you won't have to go bank for food. Hope that helped.