Tarddiad

Tarddiad is the original homeworld of the Elves. It was this world that Seren visited while simultaneously tending to Mah. She was enamored by the Elven culture and stayed with them, teaching them the art of Crystal singing.

At some point after the Naragi God Wars, Guthix visited this realm. He befriended Seren and invited her to bring the elves to Gielinor. It is unknown if any Elves stayed behind on Tarddiad.

The landscape of Tarddiad was described as being "a world covered entirely by trees", however the plane also includes many crystalline features.