I've been pondering ideas for making fast travel that's even faster than using the Nether. Overall I think Nether fast travel is well-balanced because the Nether is hostile and difficult to travel, so getting a long travel channel established is a lot of work and there's plenty of room for optimizing the path. Also, it meshes well with how you can use other methods to increase your travel speed (minecarts, horses, elytra...) in combination with going through the Nether. And since you're in the Nether, you can't rapidly explore the Overworld as you travel because you must stop and make a portal to see where you've gone. You still have to explore the Overworld, but once you have found something neat a long ways off, you can secure a permanent fast-travel path through the Nether.
So I wanted to expand upon this and make an even faster travel, following similar criteria:
1.) it needs to be potentially several times as fast as Nether travel (which is 8x as fast as Overworld travel)
2.) it needs to be optimized for very long distance travel, and a lot of work to set up, so not worth it for shorter distances
3.) ideally, it shouldn't work very well as a method of exploration but instead should be best for setting up a path once you already know your destination
I came up with a possible setup using The End which meets these criteria.
You would find a resource in The End--I haven't decided how or where it will spawn but it'll be essentially limitless though pretty rare, maybe similar rarity to shulker boxes. This resource would be used to craft a portal which you place in The End. Once the portal is activated, you can go through and it takes you to the Nether, to coordinates perhaps 8x as high as your coordinates in The End. You cannot place the portal in the Nether, and it's a one-way trip, you enter from The End and exit into the Nether.
How to use this method for a permanent fast travel route:
1.) Set up two portals in The End and set up a path system between each other as well as the central island.
2.) At the Nether exit points, build Nether Portals to the Overworld.
3.) To travel back, find the nearest stronghold to each and secure a route through the Nether.
Once that's set up, you go into the Nether, run to the nearest stronghold Nether Portal, exit to the Stronghold, jump in the End Portal, and once you arrive on the obsidian platform, take the End Gateway portal that leads to your destination, follow any paths or bridges that take you there, and go in the End-to-Nether portal, then once in the Nether, take the nearest Nether Portal to the Overworld.
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I want ocean content, nether biomes, and savanna passive mobs.