If Knights in the Nightmare coming to the PSP wasn't enough hardcore goodness (actually, greatness), Atlus is sweetening the pot by offering up a VERY cool bonus. For a limited time, all retail and PSN download copies of the game will include a voucher for a FREE download of the complete version of the PSP remake of Yggdra Union. As Princess Yggdra is a bonus playable character in KITN, Atlus is giving players a chance to experience her story in yet another excellent, super-stylized SRPG. I guess I should also let you know that the game's release has slipped a tiny bit to November 9, 2010, but it's not a huge delay (and besides, you're getting TWO games for the price of one here!)…