Minecraft wiki entry for Conduit, associated text: When activated, conduits give the "Conduit Power" effect to all players in contact with rain or water, within a spherical range of 32-96 blocks. This effect restores oxygen, gives underwater night vision and increases mining speed by 16.7% (1/6th). 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.