Aatxe (Aatxegorri, Beigorri, also Etsai 'the enemy'), the cave young-red-bull spirit, understood as a guise of Mari's chthonic domain; he comes forth in storms and by night to shelter the good and punish wrongdoers. Documented by Barandiarán (secondary).
Domains
caves and chthonic guardianship
storm and night justice
Powers
Appear as a young red bull or cow and shift into human form
Emerge from his cave in storms and at night to drive the good home and punish evildoers
Enforce the will of Mari, punishing cheats and wrongdoers