There is a hidden lift in the lowest floor of Inferno leading to a cave full of slimes. It is a great place for getting big amounts of slime balls, but you have to pay attention. It's a dangerous place.
The lift is hidden in the lowest floor maze in Inferno. No big danger shouldn't be bothering you on the way. Problems come first in the cave itself. Slimes reproduce quite easily and they simply surround the enemy and eat him alive. On the other side it's possible to get the hard-to-get slime balls here.
Location: Inferno
Scenery: Cave
Enemy: Slime
Reward: Slime balls