Black Pits 2: Any advice on final battle with the Planar Hunters using default party?

So I finally made it to Dennaton but the Planar Hunters arrive - how should I deal with them? 
My party consists of:
Archer Lvl 30
Cavalier Lvl 30
Beserker Lvl 34
Sorcerer Lvl 27
Fighter Lvl 21/Cleric Lvl22
Blade Lvl 39
Any advice would be welcome because it looks tough
cheers!

My party consists of:
Archer Lvl 30
Cavalier Lvl 30
Beserker Lvl 34
Sorcerer Lvl 27
Fighter Lvl 21/Cleric Lvl22
Blade Lvl 39
Any advice would be welcome because it looks tough

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