Learning Japanese with Berserk: The Beast of Darkness (Patreon)

In volume 16, episode 118, Guts is confronted by evil spirits who bring him face to face with his own dark desires.

Those feelings become embodied in a psychological construct called "闇の獣" (YAMI NO KEMONO) – The Beast of Darkness.

This is a pretty straightforward one. 闇 (YAMI) means darkness, 獣 (KEMONO) means a beast, as in a wild animal (deer, boar, wolf, etc.), and の connects the two words.