Eternal Summer

Nathea is collapsing and there is nothing anybody can do to stop their world from dying.
Syanna is the third youngest child to Callisto and Cimburleigh and is grateful for her lack of important duties in Nathea. When she overhears a conversation between her older siblings about a guy named Lachlan, a black mist, and her sister's odd concern for their world dying, her curiosity gets the best of her and she leaves The Winterlands in search of her older brothers in The Ruins.
In The Summerlands, Lachlan has waited for the right time to fix what had happened to his family years ago and now he has the chance to. After cursing the Gods that he had worshipped daily before he was removed from The Council - causing him and his family to give up the titles of kings and princes - he wasn't expecting to start believing in them again until he met Syanna and was led to a god that he thought could help him.