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Conduit
Description
Conduits allow players to stay under water indefinitely without the use of potions or an Ocean Prince boss head.
From the Minecraft Fandom Wiki page:
"This effect restores oxygen, gives underwater night vision, and increases mining speed by 16/7%. Conduits also damage any hostile mobs, like drowned, guardians, and elder guardians, within a range of 8 blocks of the conduit. Conduits can be activated in any biome and at any height or depth."
How to Build
The activation frame of the conduit must be built out of prismarine block, prismarine bricks, or dark prismarine block. The frame is built as follows:
Begin with a cross shape, 5 blocks by 5 blocks. This image is looking straight down from above.
Next, stack four blocks on each end, for a total height of 5 blocks. Repeat the same cross pattern on top.
Add a square going around the center of the frame.
In the bottom center of the frame, place another block, with the conduit block on top. (See below how to craft the actual conduit block)
Remove the block that was just placed so the conduit is "floating" in the center of the frame. This will activate the conduit.
If the activation was successful, there will be an effect icon on your screen.
How to Craft a Conduit Block
A conduit is made by placing 8 nautilus shells around a heart of the sea.