Fifteen villager raid farm

Stacking raid farm designed to survive server software, which is what the name is about. Fifteen villagers, a minecart you hit to trigger each raid, slime pushers moving the raiders and a nether portal doing the transport. Builders describe it as far simpler than the other farms in its class at roughly the same rates, and it is the only stacking raid farm here that people report running on Paper and Purpur. It is a pre 1.21 design and does not work in vanilla past that, because 1.21 replaced automatic bad omen with ominous bottles you have to drink. Java only. Dying inside it is expensive: your inventory goes into the minecart hoppers and pulls the redstone out of sync.

It runs on Paper, which is the point of it, but only if your server does not slow villagers down. Nash has a separate video for checking that.
Vexes are the main hazard. Slow the autoclicker to 1500ms, or 25 game ticks instead of 20, and several builders stopped getting them at all.
If you die in the farm, your items end up in the minecart hoppers and desync everything. Getting it running again means rebuilding the start of the ice path and resetting the slime pushers.
From 1.20.4 replace all the fletching tables with composters and set the click interval to 1.1 seconds rather than exactly one.
On Paper, if ravagers stall on the left side, take out the slabs above the portal and the upside down waterlogged stairs and put lava there instead. They burn through and the ravagers pass into the nether as intended.
From 1.21 it needs the RaidRestorer or Crystal Carpet mod, which puts 1.20 raid behaviour back. One builder has it running nearly flawlessly that way on 1.21.11.