This is the 16626th most frequent Polish word.
wrogiem
"Enemy."
In this sentence, 'wrogiem' is in instrumental case, serving as the complement after the verb 'być' (to be), describing a state of being.
On nigdy nie chciał być moim wrogiem.
He never wanted to be my enemy.
Here, 'wrogiem' is also in the instrumental case, used as part of a predicate after 'jest' (is) to identify the subject in the context of the game.
Wrogiem w tej grze jest komputer.
The enemy in this game is the computer.
In this example, 'wrogiem' is in instrumental case, used indirectly to indicate the entity to whom actions should not be revealed.