Flynt

Flynt is a VERY annoying boss. You have to make your way to Salt Flats, into his fortress, kill the waves of enemies that are trying to prevent you from entering. Then you take an elevator up on the deck of his "ship". A cutscene will introduce him, an easy way of killing him is just staying back and kill off EVERYTHING before you attempt to kill him. There will be several frusterating waves of enemies, each one stronger than the last. After you finish everyone off, just run up to him and kill him by scoring a barrage of critical strikes, I used a assult rifle. Alone, he's easy.