Take control of the biters and lead them to victory against the invading engineers.
Mods introducing new content into the game.
Changes to enemies or entirely new enemies to deal with.
I can't join my friend's MP server since it says that this mod has "mod event handlers that are not identical between me and the server" but we have the same mod and version, is it no longer MP friendly or is that a glitch? (It is a PvP save)