I say rename the Naga Cauldron the Slime cauldron and move it to the Slime Pits. Thematically, a device that tries to create practical effects from noxious chemicals makes more sense in the Slime Pits than in Naga City.
I'm not sure how much design space is left for a new Cursed Oasis item. What about some kind of anti-curse item? Or an item that grows in power as you accumulate curse stacks?