Bear Cave

The Bear Cave can be found North of Darkwood at the X, the entrance is guarded by two friendly bears (hence the name):

The inside of the cave ends in a large circle which makes going through and out again to re-spawn really convenient. Just be careful when leaving the cave to re-spawn it because Cerebropods often hang out just outside the cave :

The cave is filled with Hell Golems and Black Bears, despite the name you really go here to fight the Golems which give great experience and pretty good drops:

Don't forget to open the chest in the very Northern chamber of the cave, it will give 2 runes and 2 items almost every time: