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Gwydion was the last of the magic swords.


It is described to be as dark and beautiful as the night itself. Gwydion's power is described as holy, savior's light.[1]

The sword has a dark blade with a black hilt, and is made of iridium mined from a meteorite.[2] It's the twin of Truth-Teller, the sword glowing with white light, starlight, while Truth-Teller glows with dark light.[3]


It was dipped into the Cauldron by High Priestess Oleanna and given to Fionn to overthrow the Daglan.

It is said by Amren that Gwydion has been gone for millennia, disappeared around the time the last of the Dread Trove went missing. It is the last known Cauldron-Made sword.[1]

House of Sky and Breath[]

The following section contains details and spoilers for the Crescent City series

After Bryce Quinlan manages to escape the Asteri by opening a gate to travel through the worlds to reach Hel in order to request aid from the Princes, she accidentally lands somewhere in Velaris near the Sidra River instead, carrying with her the Starsword. Azriel finds her, blindfolds her, and flies her to the River House, carrying her to the living room.

A moment later, the doors to the foyer open and Amren, Cassian and Nesta appear. Bryce sees Amren first, then has the idea to try to communicate with them in the only other language she knew, the ancient language of the Fae, of the Starborn. Amren stagers back, surprised to hear her speak the language as no one has spoken it in their world for fifteen thousand years, and the others gape. Amren notices the Starsword and nods to Azriel's knife, Truth-Teller, at his side. The knife is the twin to the sword as it glimmers with dark light in answer to the sword's white light. Amren whispers that the Starsword is actually Gwydion.[3]


  • There is a Fae prophecy from Midgard that says: "When knife and sword are reunited, so shall our people be", referring to Gwydion and Truth-Teller.[2]
  • Iridium is one of the rarest elements in the earth's crust.[4]