so prettty much without vriska, they all would of died? vriska is what made their session suceed?

Nope. We really don’t know how the Session would’ve gone without Vriska, since John also took the Ring away, so there would’ve been no Aranea anywhere. The confrontation of the Kids against Grimbark Jade and Crocker Jane would’ve been inevitable, but without the rogue element that was Aranea, they could’ve had a chance.

In fact Vriska’s only usefulness to the Session was to speed up the Endgame.