Help with Stone Summit Beastmaster Quest

I am trying to beat the game as a ranger using only henchies and I am having trouble with teh Stone Summit Beastmaster quest. Any suggestions? Which henchmen? What skills? The closest I have come is to focus on the boss and throw a lot of disrupt spells - but I cannot finish him off before everyone else dies. Any help would be appreciated.

Since you rez every time you die, I generally focus on taking down a single opponent. If we all die, that's fine, it's one less opponent to worry about after rezzing, and it's not too far from the rez point to get back to where you were before. Leave the boss until last.

Usually use Stefan, Little Thom, Reyna, Alesia, and Claude.