This server-side Fabric mod adds a much needed gameplay feature to make the game more fun; giving you the ability to farm shulker shells.
This is done by making Endermites behave similarly to Silver Fish, and having them invest Purpur Blocks (only the default Purpur Block, not any of it's smooth of chiseled variants). When an Endermite invests a Purpur Block, it tunes into a Shulker, which can then be killed for the Shulker Shell drops as normal. To make farming easier, the mod also gives Dispensers the ability to dispense Ender Pearls, which does not teleport the player, but simply has the same chance of spawning an Endermite as if thrown by the player.
This mod requires Fabric. Follow this guide for how to install the Fabric Mod Loader. Once you've completed those steps, simply get a copy of the latest source code on the GitHub page and place it into the newly created mods folder in your Minecraft directory. Remember to select the new Fabric profile in the Minecraft launcher!
Have fun and please report any issues you might find!