The phrase "countless hordes" means a very large and numerous group of people or things that cannot be counted because there are so many of them. Full definition
Most of them are easy to ignore by simply skipping through the games banter and just mindlessly mowing through countless hordes of enemies. (blastawaythegamereview.com)
The point of the games are to fight or hack «n» slash our way through countless hordes of similar looking enemies. (thexboxhub.com)
The Co-Op Experience: The game allows 4 players each choosing a character to defeat countless hordes of enemies and save the princess. (co-optimus.com)