Ivy, presumably a cleric, delivered a potion of silence to Oliver Miller at the behest of either Father Young or Avgustus, both of whom Oliver spoke with a few days earlier. The conversation included talk of the destrachan encounter had by Oliver and one of the two clerics thought the potion would come in handy. It did.
Ivy proved to be a helpful ally to Oliver but a few days later, when the two of them were exploring the local caves, she got poisoned by a powerful undead creature and died. At least that’s what Oliver thought. He left her body in the caves escaping the undead. Almost a week later, Ivy was spotted as a zombie walking the local roads. Sadly, she had to be put out of her misery.