Curses

Currently knows sources of curses:
 * Cursed Treasure.
 * Destroying a gold door without paying the required gold to open it.
 * Welding the Cursed Sword.

Known curses:
 * Any damage except from darkness will instantly destroy the player. To lift that, kill the required amount of enemies. You will get an achievement the first time you lift a curse of that type. Usually curses require 10 kills but can stack.
 * The Curse from the Cursed Sword cannot be lifted unless you drop that weapon. No wonder it has such a high DPS. Never use it if you cannot freeze enemies and slash then with it.