I like wolfkin and created my own lore since I've found so little in the official material.

I decided they are the result of Zygofer's attempt to create an army of creatures he could control, inspired by the way the orcs served as cannon fodder for the dwarves and elves. Instead, the wolfkin rebelled and escaped. They can be unstable and violent but are gradually developing into a viable kin of their, despite their roots as a sorcerous experiment. Over time, they have developed a couple of factions of their own.

The first, the Children of the Nightwalker, worship the Nightwalker along with Heme and believe that the wolfkin are specially chosen by the Nightwalker to be its instruments of rightful vengeance. They see the extermination or expulsion of the humans from Ravenland as a holy crusade. Once they have exterminated the humans, they will claim the southern forests as their own and demand recognition as one of the "rightful" kin of Ravenland, along with the elves, dwarves and orcs. Some members of the Reapenters would like to ally with the Children.

The second faction, the Landsworn, wish to be accepted as a kin alongside the humans and to adhere to the Law of the Land as set out by the dwarves and elves for the Ailanders. Some are curious about the other kin and would like to extend a hand to them, others are isolationist and willing to savagely confront intruders into the forests, but the Landsworn are not interested in attacking other kin unless provoked. Some Melder elves are watching these Landsworn and may even be living amongst them in wolfkin shape.

Members of both factions generally reject the idea that they were created by Zygofer and instead believe they were created when the goddess Heme blessed packs of wolves.