Nautilium Spirits

Ancient Shell Blocks generate beneath surface ocean biomes. Mining them requires a tool above the Diamond Pickaxe tier, and they drop Ancient Shell Fragments. Eight of these fragments are combined to craft one Nautilus Shell, and the Ancient Nautilium is then produced from the shells by firing them in a furnace. Nautilium Ingots can be made in a furnace or a blasting furnace, and they behave much like Netherite Ingots as an upgrade material.

The mod sets up a smithing template that upgrades Nautilus Shell gold equipment into Nautilium gear, and it adds a fishing recipe that duplicates the smithing step. Its recipes were reworked from the original version, and the mod ships with more language support. Nautilium Spirits runs on Forge and is published only for 1.20.1, with the 1.0.0 file released under a custom license that is not open source. Because the environment is client and server, the server and every player need the mod.