The divided world
The three brothers drew lots: the sky to one, the sea to another, the underworld to the third. The earth was left common to all three, so the earth is the board, and the three realms are the essences. Each call sits where two realms meet, and the third realm is opposed to it. Each pair of realms is a deck archetype, deepest in the call between them.
Every archetype
Point at a group or a deck to see it on the hexagon, and click to keep it. Earth is the fourth essence here.