noun
boss character; boss enemy
Video game term for a powerful enemy, typically encountered at the end of a stage or level.
See also: ボス
このゲームのボスキャラは倒すのがとても難しい。
The boss character in this game is very hard to defeat.
次のステージのボスキャラに備えてアイテムを集める。
I gather items in preparation for the next stage's boss.