Spoiler Where did i leave off, Overgeared?

Wanted to get back into overgeared, my buddy says its getting really good so i want to give it another try but dont know where i left off.

Last think i remember is that they were defending against a mage and his wave of guys, and after that a new location was unlocked because someone finally got high enough level and thats the last that i remember.

Any help would be amazing.