Backwater Flagstone
A calm stone for the altar floor. Pave the ground under the altar with it (at the level of the plinths or below, within eight blocks): the Heart holds more calm, up to +30.
kindblockcreative tabFluxiongroupConfluence
Currents
Strata1What the Loupe reads: 1 in all. The game works them out from its recipes. Wheel of Currents
In the Codex
Entry 
Calm Stones — The Reckoners' weir keepers knew how to hold water level. Study Weirs.
Device
Device group: Confluence.
