I wanted to offer a simple, effective, but LONG way of beating him on Heroic with no previous training whatsoever.
The stats I had when I fought him (Equipment included): 104 Vitality 55 Strength 104 Instinct 60 Speed
The skills I used: 3/3 Restore 4/4 Ice Wall 4/4 Glacier 1/4 Mind Freeze 3/4 Flash Freeze 3/3 Regulate (Not really needed, could be exchanged with Vapour Cannon)
My Action Bar: Regulate (Can be exchanged) Glacier 2 Mind Freezes 2 Flash Freezes Ice wall Restore
That makes all 8 spots.
The Strategy:
Do them in this order, don't question the method before you use it:
Stun Glacier Stun Glacier Mind Freeze Glacier Regulate(As I said, can be exchanged with Vapour Cannon) Glacier *He does the Subversive attack* Mind Freeze Repeat from start.
Well i do something else which i believe a little more proof of guaranteeing victory.
I use:
Vapor cannon Vapor cannon Mind freeze Until mind freeze ends, vapor cannon Then flash freeze Vapor cannon Flash freeze Vapor cannon Mind freeze....
Yeah you allow him to do unknown condition but then use mind freeze. You should have 2 flash and 2 mind freeze. Whenever you need healing, use flash and restore because if you don't allow him to attack without focus, he will do only his normal attack without decay, collapse, and shadow state.
That does work, but with my strategy, I had poor healing, so I made use of Ice Wall so:
1. I take less damage until stun finishes cooling down. 2. Restore heals me to full health.
Of course, he needs to be mind frozen for that to work perfectly. That way, I don't have to use flash to be able to restore and still keep on the fight in a steady pace.