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“Thresholds are more than randomly chosen divisions between rooms. They’re places where change – transformation – happens.”
— Emily Henry
The cosmos of Trynnalta are bisected completely across the horizontal axis. The demi-plane of Annwn runs through the planes, separating the Celestial Arcs from the Threshold below. The Unknown is another liminal space, a vast ocean of nothing and everything where the Unknown exist, hanging eternally in the darkness and filling it with their light. The Supernal Sea is the partition between the mortal realms of Trynnalta and Otherworld, and the greater cosmos.