King Caelwyn was once the High King of the island (we’re open to Celtic-sounding name suggestions!) uniting the tribes through war. But as his power grew, so did his fear of death. Desperate for immortality, he offered his gold to the fairies.

The Fairy Folk (or perhaps a trickster god we’ll invent?) saw the darkness in his heart. They tricked him: build a great cairn beneath an old hill and place the final stone under the Harvest Moon, they said, and his reward would come.

When the last stone was set, the moon burned him like silver fire, scarring his flesh and marking him forever. Humiliated and enraged, he turned on the fairies, burning groves and breaking sacred places.

In time, King Caelwyn died, cursed and broken. His followers buried him within the cairn he had built, sealing the tomb to only open beneath the same Harvest Moon. Yet they didn’t know the final trick: the cairn itself hid the gate he sought. Now, the Moonmarked King is forever bound, guarding the threshold to the Feywild, trapped at the edge of the land he longed to destroy.