Basic Facts:
- Endstone cooked in a kiln produces White Cobble and Ender Slag.
- Ender Slag then cooked in a stoked cauldron separates into Soul Flux and Brimstone.
- The texture looks like a white powder (similar to niter), with a shimmer like enchanted items or soul urns.
- Combining Soul Flux in a crucible with Iron, Coal Dust and a Soul Urn produces steel.
- The end is made up of only Endstone and Obsidian, with lots of Endermen and the Ender Dragon.
- Endermen pick up blocks in the overworld, and teleport away (presumably to the End). Appearing in the end they are now holding Endstone, which they place down before teleporting away again (presumably back to the overworld).
- It is implied through one of the BTW canvas paintings that masses of souls / Dragon Orbs go from the overworld, filter through the Nether and then pass to the End.