End pillar obsidian farm

cubicmetre's end pillar obsidian farm, the fastest obsidian farm that exists and by some distance the hardest to build. Withers held in cages destroy the end pillars while the dragon respawn ritual regenerates them, giving 240,000 obsidian an hour. This is a Wavetech engineering showcase rather than a survival tutorial, and it comes as two world downloads instead of a build guide. Worth it only if you genuinely need obsidian in the hundreds of thousands.

• Still works on 1.21 with one change, a dispenser loaded with arrows at the end of the crystal conveyor. The same builder finds the ritual only fires on every other crystal.
• The regen wall gets cheaper if you separate the lava by two blocks.
• Expect the build to dwarf the running. One builder spent thirty hours assembling it and three hours farming, which covered an obsidian castle and a gold farm.
• One comment claims the massive world download is empty and contains only a session lock. It does not, the archive is a complete world.
• Several people argue the simple end platform obsidian farms are still the better choice, because almost nobody needs this much obsidian.