Nautilus Shell

A nautilus shell is an item that is used for crafting conduits.

Fishing
Nautilus shells can be rarely obtained as a treasure item from fishing. Chance of drop increases for each level of luck of the sea on your fishing rod

Drowned
3% or 8% of drowned will spawn with a nautilus shell that will always be in their offhand, which will always drop upon death.

Trading
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Trivia

 * Nautiluses are animals, which occupy deep oceans in the real world. However, they are absent in Minecraft, and there are currently no plans to add nautilus mobs into the game.

Nautilusschale Coquille de nautile 앵무조개 껍데기 Nautilusschelp Muszla łodzika Concha de Náutilo Раковина наутилуса Nautilus Shell 鹦鹉螺壳