Natasha "Yggwilv" Zybilna is a wanderer of the multiverse, a visitor to Quelmar from worlds far beyond, potentially through a gateway such as Sigil or through another means of universe hopping.
About
Yggwilv's original universe is thought to be Greyhawk, though others believe she hails truly from Faerun, having only first appeared in the Greyhawk record.
In any case, it is likely that due to there being a Tsojcanth in Greyhawk and Quelmar alike, Tasha was drawn to the area of Isonhound to see what other echoes of her worlds lay across Quelmar.
She is known to travel via Yggwilv's Hut, a large shanty with chicken legs.
Pets
Tasha had a fascination with various creatures and entities from hellish landscapes, after all she herself had once written the Demonomicon.
Larva Babies
She keeps a large pantry of daemon larva, which she cares for like farm livestock, taking them out occasionally to the far realms and hellscapes to graze on their natural grasses. Her plan with the babies is still yet unknown but boy is it disturbing.
Silent
At one point in history, ancient or otherwise, she had picked up a stray demigod of death, keeping it detained inside her hut through powerful rituals. She was not pleased about re-releasing it into Quelmar, but she had promised a "Wish" to anyone who had slayed The Green Stag, and releasing Silent was a lot easier than actually casting Wish.
History
In 825 PR she had popped into Quelmar from afar in order to feed her livestock daemon babies. During this excursion she crossed paths with Delphi and Durian, both who would become greater powers in the realm upon their ascension to the Ruby Court. Curiously, the Sardior herald Herneldo was also found in the woods that same day, and she had picked him up to feed to the babies. Other lucky (or unlucky) visitors on that Friday the 13th included Ensign, another traveler from a far off place.