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A firework might not be the best idea because their movement is very hard to control. You could make a row of fireworks like on Hypixels...
They could also place the lapis in the enchanting table when you open it and make it impossible to take it out. That would fix it.
Fisherman and Launcher. Launch them right out of the forcefield (old forcefield with the giant wall). Got more or less my first win with this...
They nerfed Portal some time ago. If you go now through the portal you won't take fall damage.