Health Potions heal Health.

A tainted Health Potion damages Magic Armor because it counts as Poison damage.

I don't think this is how it should work. If you consume a Poison Health Potion, it should just inflict that directly onto your Health.

Not only would this change be great for trolling, It would have some nice synergy with the Necromancy skill tree (Shackles of Pain, Death Wish etc.)

I think the solution is to change the combination of Health Potion + Poison Bottle/Zaikk's Talon to make "Tainted Health Potion" and that this item does Piercing Damage. Keep the Poison Bottles in the game as they are easy enough to make (Empty Bottle + Ooze Barrel).'