Phantom Ring
Mobs respawn when you leave a room rather than after a save.
How to obtain
Open the chest marked on the map to obtain Phantom Ring.
Acquisition location
Clock Tower · Western Ascent
Usage tips
Useful for farming enemies by moving back and forth between adjacent rooms; while traveling, watch out for enemies reappearing in rooms you just cleared.
Backstory
Designed by a heretical architect, this object seems to deceive space itself.