Enemy sound effects, mostly in the form of voices. Soldiers calling out contacts and orders over the radio, an announcer warning that the other team is on the move, a goblin screeching battle cries, a ghost muttering threats down a corridor. Barks, really. The short lines an enemy shouts so the player knows where it is and what it's about to do.
Enemy barks do a lot of quiet work in a game. They warn the player, set up the fight and give an NPC some personality before a shot is fired. The military voices come dry and as processed radio versions, so the same line can be shouted across a room or crackle over a headset. The fantasy side covers the goblin, ghost and wizard you'd meet in a dungeon, with proper Dialogue as well as screams and efforts. Shooters and RPGs both need plenty of variations, because the player hears these lines over and over.
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