Primeval Owlbear

Created long ago by misguided mages, owlbears combine keen avian eyes, thick feathers, and a tearing beak with a mighty bearlike frame. Despite their magical origins, owlbears have propagated and spread to wildernesses across the multiverse. Owlbears dwell in distinctive dens.
Ancient forests and Feywild demesnes steeped in magic can give rise to particularly large and vicious owlbears. These primeval specimens can fly—albeit poorly—and emit thunderous screeches that can rattle foes and even tear them asunder.