Do seasonal spirits with "natural" attacks (e.g fall bear, with vanilla "claw") count as magical for the purpose of hitting fellow ethereals?
If not, it seems like two Groups of fall bears or WWolves could flail at each other quite ineffectually for some time.
An inadvertently efficient "meat" shield against other ethereals?
Maybe an Ether Claw new weapon type is called for?
Rabe the Beastiary Booster