The Ritual of Gaia entry states that Terrasteel is used to start the Ritual, but Terrasteel is made from Manasteel, Mana Pearls and Mana Diamonds - all resouces the Elves are running out of. Further, the Lexica states that the Ritual isn't rare (I don't remember the exact words, but that was the impression I got). Perhaps a tweak in that Terrasteel can also be made from Elementium, Pixie Dust and Dragonstone? This isn't really necessary, but this issue has been bugging me for a while now.