VoiZod: I'm sure there are countless other ways to do this, but what I did to defeat the final boss is I used Anoint with my Cleric, Inspire with my Warrior, then finally Charge with my Barbarian. Since the boss occupies the back row with nothing in front of him, this tactic worked well for truly massive damage right off the bat.
To beet baron with a psychopath, use Free Will a lot on your allies and remember to limit the amount of times you use dark infusion so that he doesn't gain his focus back to quickly. Also, when you low on focus, use dark infusion on yourself then transform into the psychopath. Don't forget that you need to use terrify a lot to keep yourself alive. Keep Veradux on defensive and Roan on Tactical, you should take 'em out easy.