Untold Legends: Dark Kingdom (PS3)

Defeating the spider creature in The Grinder
Go to the front of the place where you are fighting. You will not get hit by the lava coming at you. Keep pressing Square when the enemies appear.

Easy experience
Get to the room in the Cursed Cave where you must throw the skeletons into the barrier. Do not throw them. Instead, just kill the skeletons. They will keep respawning and you will be able to gain has many levels as desired.