use biological or hydraulics(i dunno if its hydraulic or psycho cuz i don't play sonny 2 for a long time) which has focus-depleting skill such as regulate and disrupt.
Hydraulics is the worst one against the baron. If you don't destroy his focus fast it can be a long battle; then be sure to have good heals for both life and focus.
I don't remember what caused him to do this, but at some point he'll use an attack that'll cause all your attacks to do 20x damage or something ridiculous like that to him. I'm fairly certain it requires focus, since he didn't use it in my earlier battle where Roald and I kept stunning/silencing him for about 50 turns. The worst part about this battle is that Tick Tock move he uses which basically says "you're dead and can't do anything since I'm going to spam this on you until you drop". It requires focus though, so use that against him.
Basically, just survive his onslaught until he gimps himself with THAT attack, then go all out in the ~5 turns you get. Hope this helps.
Brixius is quite simple once you know how to beat him. I will be able to tell you how to beat most guys cause i've completed sonny 1 & 2. Anyway back on topic. you need to drain his focus, then he gets hurt massively. If you are a Biological, use disrupt. If you are a Hydrological, use regulate. If you are a Psychological, use traumatize. To escape 'tick tock', put veradux on phalanx mode and roald on aggresive. that way roald will do some damage and veradux will heal you. Tick Tock damages you for 10% of your health for 10 turns. so if veradux heals you, you will not die. hope that helps!
nedster123456789 I kind of guess that you're stuck with the enemies with a lot of life. What you do to beat them is there is a move that takes 30 focus from the enemy so what the enemy does is it takes it's focus back but it loses life. Keep using that move and soon you'll finish off the enemy.
Check the different attacks you can buy. One of them drains focus. Use this attack on the Baron as much as possible! Baron Brixius will DRAIN HIS HEALTH TO REFILL HIS FOCUS which is nice because his focus can be drained in, I think, two turns. Put your two men on full defense too. So if you keep doing that and get the medic to heal you, you'll be good.
I recently started playing Sonny again since I never tried the other classes. In basic, survive and drain his focus if you can(i just went with survive because if forgot to get and focus draining stuff and I'm to cheap to buy re spec.) and he will slowly commit suicide. Warning though, the baron curses at you and says "you scratchy @#$%" a lot (I hope the mods won't drop their ban hammers on me for using @#$%).
a psycho can do with traumatizes and FW's, a bio has disrupt level 2 which drains 100 focus at once, forcing the Baron to immediately start killing self, and hydro has mind freeze to prevent the Baron from using anything that uses focus, this means no Tick Tocks but long battle, and has Regulate to drain 30 focus at once, which can be used repeatedly, so you drain 90 focus off him (FF-regulate-FF-regulate-regulate) and he hurts self, then you mind freeze so he'll not hit you with ticktock.