Gortasch is impossible to me

Gortasch is easily impossible for me.

Even if I manage to deal damage to him, he suddenly gets a lot of life, knocking everything away with his hand. The steel guards kill me and the adds around me.

I'm playing a Druid with Circle of the Land, Shadowheart as the Domain of Cunning Clericer to heal and protect, Laezel as Battlemaster (tank) and Karlach as Wild Magic Barbarian.

Everything in this room kills me within minutes, I can't win even if I buff myself first.

Tried for several hours after I could put Orin on easy but I don't see any win in this fight.

Am I too stupid for this game or what is the problem? I was able to put everything before Orin on normal but I can't do Gortash and the fight in the House of Mourning.

I'm already thinking about starting again