By ruining the Baron's focus, you can defeat him easily. As a biological, you'll see a good comment in the most rated ones (about the disrupt ability) by Knuffy2; as a psychological, it gets harder. Your best offensive weapon is the haunt ability (at grade 2, -5 focus every turn over 40 turns) combined with the high voltage (at every grade, +20% damages, so cast it when the Baron is bound to use his famous Burning ability) and traumatize (at grade 2, -15 focus every turn added to the stun, over 2 turns). If you need focus, don't forget to use the electrical storm (it costs nothing but the bonus is weak, only 8 points during 3 turns), the dark infusion on yourself (Veradux will heal you, and you'll recover 15 focus every turn over 3 turns for free) or the wraith form (+50 points, but don't forget the cooldown of 10 turns). Never use the shock coma, as it will make him recovering some focus
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when you stun something that is already stunned it stands up then sits down again but when it waits the first one off it just stands up and when it runs out of the next one it neels and then stands up again it is crazy!