Although it's a little late in the xpack, I figured I would go ahead and post this anyway.
The areas marked on the picture (infront of those skull things on the wall on both sides of the room; red dots on map) are spots where the slime pools that cover a quarter of the room at a time will not do damage to you, even if you appear to be standing in them.
This can greatly help if you have some kind of defensive cd to use when a slime is exploding so you can just absorb that damage instead of moving, and if you're lucking enough to never get a slime on you, you'll never have to move.