If your PC's would try something as ridicolus as making Zygofer a good guy than you just simply say no. You are the GM, bend the rules like you want and find reasonable but try to keep your players happy at the same time
https://www.wikiwand.com/en/Tilberi This is just too good to not use in Vaesen and maybe with a twist. A Icelandic witch was burned on the year 1580 for having this creature. I'm thinking about something like this: If the creature manages to get enough milk (maybe it could be changed to blood ?) it...
I have already made a hexed map for Iceland (you can google old icelandic map to see what I used, it has old vaesens around the map. This is a example https://icelandmag.is/sites/default/files/styles/lightbox/public/thumbnails/image/abraham_ortelius-islandia-ca_1590.jpg?itok=zn8CGLPP) and I plan to ...