How do you stack the whetstones? Not sure which item does that since I've know every item in your inventory except for the ones on the right, which is just a random curse and im assuming cleaning ring? (for curses)
The golden whetstone is a onetime use that increase the weapon by 25% permanently.
Right side is an energy setup with curses. Every amulet gives 1 energy per curse next to them for the start of the combat.
Oh, for some reason thought it was till end of combat