Eh, I thought I'd add something, but then I reread the notes and noted that it said "vocal" not "verbose" so I wasn't sure it aplies to me.
Is the cauldron preppable or not? Appears in the shop or not? Because if you can get cauldron + mass retaliate, you could stack youself silly with debuffs and get more out of your potions (doooh). The only problem is - where and how does this make sense?
Poison goes away and... is not stackable?
Curse would actually be a good idea unless youre going melle, since having one and having a million is the same.
Stacking corrosion? Well, I see some potential there, except you'd need a lot to make it worth it. Or would you? Problem is, the guys who'd want the extra healing are melee, and they'd be trading damage per hit for health per potion.
Stacking weakness on a mage of some sort? How much of a benefit?
How do you unlock the thing, and does it show up in the shops?