The phrase "multiple foes" refers to having more than one enemy or opponent. It means you are facing more than one person or group who is against you. Full definition
Even then, however, the jerky nature of some types of mimics and difficulty fighting multiple foes makes battles some of the game's low points. (rotorob.com)
Prepare to take part in tactical combat against multiple foes! (gamespace.com)
I think the idea here is to get good enough to rack up killer combos and take multiple foes out more quickly. (thatvideogameblog.com)