legendary beast; magical beast
A creature from myth, folklore, or fantasy settings, often possessing supernatural powers or monstrous traits. Common in games, light novels, and anime.
In that game, players defeat magical beasts to gain experience points.
A legendary beast is said to live deep in the forest.
Compound of 魔 (ma, 'demon, magic') and 獣 (jū, 'beast'). A modern coinage common in fantasy media; not a classical term.