Rokugami

Rokugamihiko-no-Mikoto, also known as Rokugami, is a deer god worshiped by an ancient Japanese religion.

Rokugami's curse
After Rokugami's sacrifice, his sisters attempt to take vengeance via a multi-generational curse that will one day allow them to bring calamity to mankind. The curse manifests as versions of Suzunome's descendants with wooden deer horns.