I know for a while it was unknown what the 4th equipment slot is for, was this something implemented in 1.1? I'm referring to where you can equip 2 rings and a fishing bait. There is an unknown 4th one with a flower. I'm pretty far in, just haven't completed the mermaid storyline yet. I am at the point where I'm just waiting "waiting for the date" to keep it vague. I don't mind minor spoilers.
#Empty Equipment Slot
neon orbit