From Guild Wars 2 Wiki
Either complete the Morgan's Leap jumping puzzle, then continue to the north and west across some floating rocks to enter the Dreamdark Enclave or go through the entrance on the ground level to the southeast.
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|Your goal is to jump down mushroom pads into the Dreamdark Enclave, grab a basic Chest, and then jump up another set of mushrooms to complete the achievement (and find another chest). You will be confronted with Nightmare Mortars, Bursting Brambles, and various members of the Nightmare Court. Use appropriate caution, especially on the floor of the enclave. Mortars can knock you off the ledge, so be careful where you stand when fighting them.
- The worst spot is a heavily slanted leaf about 2/3rds of the way up that appears to be almost undoable. You miss it, you usually fall to your death. The trick to it is to go to the "top" of the launchpad leaf, about the middle of that side, and jump to the lowest edge of the target slant leaf (which appears to be too distant) and do a mid-air turn as you get to the top of the target leaf. If you cannot make this work, it is usually easier to jump onto the stem supporting this particular leaf and jump up onto the pad from there.
- As a result of this having a long section where any error in jumping means a death-fall, it's a rather good idea to have a friend able to help you by reviving you.
- For the heavily slanted leaf, you CAN jump to its stem, then jump up from the stem over the "back" side of the leaf and onto the leaf itself. It is much, much easier to do it this way.