After the boss at poison gas room with the fan, instead of doing the second jumping section with annoying harpies, you can go out from the other exit and stuck up in front of the block shown in the attachment. I don’t know about engineer skills but I guess one of the turret can be exploded? and that will make party members push forward through the block to the last boss.
Elementalist lover since GW1. It’s the only profession I play!
