Name a better duo than vampires and werewolves.
Taking the entire premise of ETR and flipping it to reflect vampires' natural enemies is a great concept. I do think you missed an opportunity center it in London and get to use the title Werewolves in London though....
I do like each of the werewolves. They each feel different from the others in a way that's very enjoyable. I do think that Kessler could use a little bit of narrative work to catch up to the other five. Mechanically, the concept is unique, I just think that maybe the background text at the top of the character sheet could spend more words on his ever-burning rage that seems to fuel the rest of the character design. That is an extreme nitpick though.
I second the feedback on the Savagrey mechanic. I personally like that it gives the GM more to do, Like others have said, maybe getting the pool up to 10 is too much. If you cap the pool at a lower level, it would encourage the GM to use smaller amounts more frequently.
Lastly, I do feel like the game would rely on a fundamental understanding of ETR to play, as some of the core pieces of ETR aren't directly explained here. It might be a good idea to rephrase those pieces at least passingly, so you're able to play the game with only this doc as a reference point.
Great Submission!