We all know jumping over the wall to the last boss for magg's path is fixed, but you can still get double end chests (just normal loot, not tokens). Before you start defend Magg while he plants event, jump through the right gap of the boulder door and the wall (takes some tries via running+jumping through AND NOT OVER THE WALL) and killing the magma stone. After you kill the magma stone, you return to the defend event area and complete it. You get Magg's event chest and 2 last boss chests to spawn! (the chests are ontop each other... make sure to loot twice).
EDIT1: You don't have to kill magma stone again nor worry about aoe until after magg's event, so it's like easy mode last boss.
EDIT2: If you do the same door jump method for the 3rd path's door near the camp, you can go in and kill the siegemaster and get his chest. It's a fast extra chest for those running other routes, and I think the 3rd route's npc follows and helps you on the other routes. This also is a shortcut to skip the torch lighting part of this route if you are running route 3.