I am struggling with the Pomab Boss fight. The battle log says that I have done about 500 damage (maybe even more) to him once my Haste spell runs out but he is still alive. When I attack the clones then I get a message that they didn´t take damage because they are magic trickery. I ignore the crystal constructs during the fight but to no avail. My squad is buffed to the gills with spells and potions although it doesn´t matter in the end.

Is there a special trick that needs to be performed? Like interacting with scenery maybe during the fight? I don´t know.