I dont know if this helps anybody. A blue item, level 5,15,25 etc is the same as a green item, level 10,20,30etc item. Thats on a chest not sure about weps and off hands
On cave #5 u have to have your goblins,dwarfs and Taurus maxed for most population then u use comet(rank 5) to stun lock the goblin and u use lighting spell also to stun lock the goblin.