Welcome to the New and improved End, now without all that pesky atmosphere.

When you rocket up to the end, remember that it is well away from the atmosphere of the overworld. As such, you will need to take precautions, lest the fluids in your body start to bubble like carbonated soda. Fortunately, there are a few solutions.

Water Breathing, Turtle Helmets, and Conduits
  The water breathing and conduit power effects were made to help balance out sudden changes in pressure, the ones that usually cause the bends. The turtle helmet in particular is very effective, as it supplies the user with an infinite supply of water breathing when they are outside of the water. For base building and long term projects, I would recommend the conduit, since you don't need to wear additional gear in order for it to work.

Slow Falling
  Slow falling works by filling your body up with helium. This is enough to counterbalance the loss of air, so your body stays at 1 atm and all your juices stay inside. This one works great if you are trying to make long distance journeys for end busting.

The mad scientist who came up with this idea is known by the Dr. FishStacks. This was a commission for him after I lost the race to 100 subs. It only took eleven commands and one predicate, so I might give him a do over. What do you guys think?