1-20 Random things in level 1 Stronghold of security
20-60 Rock crabs or 20-40 rock crabs
60-80 experiments or 40-80 experiments. (must have done priest in peril, restless ghost and started creature of fenkenstrain.
80-99 experiments (with red chins/chinchompa's) they are pricey. but it is the fastest way.
there is other optional ways like those ogres out near the gnome stronghold but you have to do a quest not sure which 1 it is. if you have any things you would like me to replace with add a comment. or any optional things.