Well, it seems there is only one way to fight the Sparkmaster.
Leave one main character behind with the ... civilians. take the rest forward and start the fight head on. Try to stun it or freeze it. Use summons to draw its attention away.
All these barely work and mostly dont.
My original mistake was that i tried to sneak right behind it - with invisible-sneaking character - and then use the controller.
That would only make it attack that character, repeatedly, regardless of the commands to go berserk or to "disable weapons" which "works" as well as i described it. It takes away only the first of the four attacks it can do in a turn.
The rain spell only extinguishes fire that was there before. Any subsequent fires are unaffected by rain that is still falling. If i use rain spell or scroll again - it only affects fire that is already burning, not any of the subsequent ones.
As the fire is malfunctioning in general - it creates additional problems of its own.
The blitz bolt and headspike do not produce stun of blindness status effects on it.
Blast of cold and ice arrows freeze it. (it seems blast of cold now freezes anyone wet, not necessarily chilled). Stunning arrows do stun it.
(if you dont have any of those, youre pretty much fu... fudged)
Ice spikes do nothing.
Its resistant to fire and poison.
And then you have those recruits running straight into it despite everything they say about it previously - despite way out being easily accessible, behind us - which they should use, instead of running after one of my characters and joining the fight.
