@NoobClone You're basically stuck. It happens when an already dead character finds itself in a new fight. If you can, ascend...it will get you out of the loop. If not, there is no remedy except restarting.
@Mori A couple of pieces of advice: 1. You don't have to fight everything. If a particular boss is too strong, don't fight it. If it's in the way of the stairs, use a scroll of deception to get past it. 2. Be sure you're taking advantage of your potions.It's easy to forget about speed or snake's blood potions before a crucial battle
How about, instead of just voting down the guy's comment, you help him out instead.
Using a portal scroll will take you to the shop, where you can sell and buy items.
I didn't say you don't take damage. But after a few rounds one of those hits against you heals you instead of harming you. I have never seen any character of mine with a defense over 100 die.