Teia is the name of a goddess, she was honored as a titan of gems, the bright blue sky and precious metals. She was born in the void as an offspring of Padomay. All what's left of her is the name of the isles, but, maybe some Wild Elves remember her cult, who knows.
Teia lies well hidden between the Sea of Ghosts and the Eltheric Ocean in nobody's land. It's the stage where Tasheni Followers mainquest will take place. If I come that far...