Qual chose to become what he was by his own free will. The sylph embracing a power that turned him to be it's agent, it's hand, it's mouth. In his hunger and stupor, Qual murdered almost every living thing on his island home. All those that raised and loved him; slaughtered and eaten or converted. Death born of desire for power and vengeance... it's an old story. For those of you who believed his sory-ing and came to be there when he was finally laid low; I'm hoping you didn't know the facts. It would explain the gross inaction, and why you didn't throw his shackled carcass into the Ha'and.
According to the woman who bore the Separ previously, it is a creature, a hunger that moves about the deep and consumes. It is the dew's mother, and an old power that found a banished malcontent wandering the leagues of wet dark. It is migratory, moving from place to place, though the how wasn't mentioned. The Separ was the tool meant to stop it, to bring about justice and to cease the spread and had been held by its last user for an unknown time. The woman who bore the though-shaped scepter was rumored to have died soon after she arrived unto Puddleby, though not before passing it onto one Doctor Mathus, a healer. The hows of her death are unknown to me. Was it old age, or was her life force stripped to power this tool of deliverance? Was she murdered by an infected?
Living fires and emotion fueled her Separ. An individual couldn't swing it for very long, nor could they hoard it. It channels the emotions and life forces that well up through the heart and hands that guide it; and can be used by one for only so long. After a few infected had been cured, it needs a new source, a new host. When my time came, I would not wield it, nor touch it. I hated it and still do. I had brooded over its location for long months, following lead after lead. I hate that it came so easily and wasn't found atop a cavern alter, or within a pool of purest water. For me, it was anticlimactic that it was simply given over, rather than found. In the end, the Separ ended up in Yor's meaty fist and heavily down on Quall's undying skull, and what loose end kept me to Puddleby was gone, so I left Puddleby for good.
Where is Qual now? The man is gone I think. He was a thief before his temporary undeath and has swindled his way to freedom. Where he is now can only be guessed. Maybe he still huddles in some corner the libraries sanctum, or rightly dead having been drowned in the sea. The Deep Bubbling, may have moved on, though who knows. For now when you find yourself in the leagues of dark, where the slime grows thick, and the stench of death and rot is old, be vigilant.
As for Votenkath; he and his are undead. I can only presume this was out of desperation, the ultimate results of the long siege, or a misguided intent on fighting fire with fire. They are best left alone to wander their castle tomb.