Minecraft Elegance: Looting Slime Farms, 6000 dph (in Swamp) to 42000 dph (Java 1.16-1.20*)

IMPORTANT: When you are looking for a build site, make sure that your feet are no higher than Y 69 when standing on the future spawning platform. Slimes will not spawn at Y 70 or above. Note that the swamp hills biome does not spawn slimes.

* Java 1.18+: The looting portal elevator remains very useful in 1.18+. Swamp-based slime farms can be vastly more powerful in 1.18+, but this video is not a good reference for leveraging those mechanics. The build tutorial works in 1.18+, but is mostly applicable to 1.16 and 1.17. For 1.18+, you can skip the cats, wolves, turtle eggs, snow trenches, and the trapdoors around the golem. Within the circle of dirt/grass in the spawning area, replace any blocks that have light level 0 with podzol and place brown mushrooms on top:
https://imgur.com/uuz2BpP
Brown mushrooms can be farmed using this:    • Minecraft Elegance: Versatile Tree Fa...  
Or use glow lichen in this pattern: https://imgur.com/2TBIvEw
Building a roof to darken the spawn area will allow slimes to spawn during the day. This video is a good reference for these changes:
   • The Ultimate Guide to Minecraft Swamp...  

Discord:   / discord  

MULTIPLAYER INSTRUCTIONS:
This slime elevator will work without issue in a single player world, or if you are the only player on a server. If there are other players on the server, it will work properly if nobody is in the nether, or you can have a friend or alt account stay near the nether elevator to prevent the slimes from despawning. Refer to 13:50.

Comparisons and links:
IanXO4 swamp-based slime farm (6k dph, full moon) world download: https://www.mediafire.com/file/tj54wz...
IanXO4 edit of gnembon slime farm (42k dph, Thanks to Hard for providing the WDL): https://www.mediafire.com/file/nqplm2...

Emdy's excellent slime farm reference:    • The Ultimate Guide to Minecraft Swamp...  

Techman88 swamp-based (1700 dph, full moon)    • Minecraft 1.13+ Very easy Slime Farm ...  
Logicalgeekboy (1600 dph)    • Easy Slime Farm (No Beacon Required) ...  
Ilmango portal-based (17k dph)    • Portal Slime Farm (Simple&Efficient) ...  
Gnembon (17k dph)    • Simple and Unbreakable Slime Farms fo...  

Comments and tips:
1:36 There isn't enough room for spiders to leave the portal, so they never have a chance to cool down, and they can't re-enter the portal.
2:38 Zombified villagers and baby zombified piglins also appear.
2:49 Shoutout to Techman88 for his farm design that inspired how this farm uses trapdoors to shield the iron golem's eyes.
3:26 The baby zombie can see the iron golem under the trapdoors, but is unable to pathfind to it because of the snow.
5:00 Zombie piglins will show up at the AFK portal, but they do not come from the spawning area. They show up due to their natural spawning that occurs in all overworld portals. These zombie piglins are harmless and will die when you kill them in the chamber.
12:00 Use an autoclicker or macro to attack about every second if you want to actually "AFK" (away from keyboard). A minecraft night lasts 8 minutes, starting at 13188t. If you AFK in this slime farm at the start of a waxing gibbous moon night for 50 minutes (including Minecraft daytime), you can expect around 2k slimeballs. The actual rates will vary slightly depending on regional difficulty; setting your world to hard difficulty will increase the productivity.
12:06 Techman88's swamp-based slime farm produces about 225 slimeballs on a full moon night, which is about the same as this farm on a crescent moon night.
12:49 The 4 hoppers can handle 36k drops per hour if you direct them into separate chests. If you have higher drop rates in your farm, use double speed hoppers.
13:35 See paragraph below.
13:50 See the multiplayer instructions above in the second paragraph of the video description.
14:13 Lure a nearby cat by standing still while holding out raw cod or salmon.
14:51 Any meat can be used to breed wolves.

LOOTING GNEMBON SLIME FARM
Portals can only be 23 blocks tall, so you'll need to stack 2 portals, one on top of the other, in order to cover one side of the slime chunk. The horizontal obsidian beam between the upper and lower portals will block big slimes from entering that portal. You can work around this by staggering the placement of the horizontal obsidian beams between different platforms so that the big slimes can still reach a portal on one of the other sides of the platform that is not obstructed. Big slimes will almost always get to one of the other portals just by randomly jumping around. Medium and small slimes are not obstructed by these obsidian beams. You could probably eliminate the top 4 or 5 platforms with little impact to the spawn rates. There is a layer of string matching the top platform to increase pack spawn rates. Torches on the platforms do not interfere with slime spawning, so you don't need to be concerned with placing too many.