I have killed Garou several times now. I have come to the conclusion that he by killing the shadow guardians around the tower you can get him to spawn. I believe Lodizal is on the same cycle as I have seen him spawn twice at same time as Garou after I killed the guardian mobs around tower. He has dropped the skin only once out of the four times I have killed him and then I was unable to sell the club for the 6k that I wanted for it, so gave it to my druid friend.
Melanh
Infinity Watch Co-Leader
Terris-Thule