In Shadow Destiny, the Guardians will play a slightly bigger role than they did in Royal Destiny. This is because in the timeframe of SD, the Guardians were a much bigger part of everyday life and they generally played a bigger role in the lives of ponies, especially the High Queens. In order to freshen up everyone’s memory, here’s a brief history of the Guardians. Please note that this does contain spoilers for Royal Destiny.
The origin and story of the Guardians
The Guardians were created by the Supreme Goddess Vitalia to watch over the world in her place. In a way, they are her children, first born on earth to a mortal pony. After a long life, they passed on like any other pony, only to return as an immortal being. The Guardians are alicorns and report only to Vitalia and the High Queen.
Eventually even the Guardians lost their link to the earth and all that remained of them was a part of their soul stored in stones which were spread out over the continent. After the death of Aras the final link between the Heavens and the earth was broken and Taira and her family traced the stones. Twinkle Star managed to resurrect the Guardians and restore the link. The first years after their resurrection, however, the Guardians were rarely seen as they were busy securing the link to make sure it would never break again.
Saule was the first Guardian and is often sought out by the others for guidance.
Roze, nicknamed the Flaming Guardian. She watches over the balance of the elements.
The copper Guardian. More so than the others, Laima watches over the earth itself instead of those living on it.
Her role was guarding the prana, or life force, of the planet, making sure it was distributed evenly and that nobody abused it. As such she came to care for all living beings, especially plant life as the others seemed less concerned with that.
For a long time, Fiume was the youngest of the Guardians and was nicknamed the Guardian of Water, because of her love for aquatic creatures. She formed a strong bond with Twinkle Star and through that with Câlin and Meran.
Aras, the Earth Guardian, was the only male. His role was different from the others; he was more connected to the earth than his sisters and he was meant as a link between them and the earth. This made him feel inferior to the others and in the end he rebelled against them. This rebellion failed and he was reduced to nothing but a spirit.
Eventually Aras managed to restore himself and he sought to break open the gates to the Heavens once more, but his plan was stopped by Twinkle Star and Taira.
Liuven was sent to the earth in a final attempt of Vitalia to protect the earth she had created. However, because Vitalia was very far away by then and because the oldest daughter of the queen of the Friendship lands and the heir were not the same pony, the soul was split in two, resulting in two girls who were part Guardian and part mortal: Illuvia and Twinkle Star. Eventually after both ponies had passed, their mortal parts died while their immortal parts became one once more. She returned to the earth when Câlin and Ruki summoned the Supreme Goddess one final time.