Somehow, this love potion nearly resulted in a psuedo-zombie apocalypse. I said pseudo because the "corpses" aren't weak to light like proper undead. Instead, they seem to be mutated humans with no elemental weaknesses.
Boss: Leilana [ 10:22 ]
Fortunately, she can't inflict poison like the corpses and she's weak to wind.
I have no idea if Leilana is vulnerable to poison. Unlike me, you could try completing the Dragon Boon sidequest before fighting Leilana to check if it works.
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