The Leviathan's Constellation

In ancient times pantheons existed. They would have relations with other pantheons, mortals, or creatures, mixing the bloodlines. In all ancient religions you have stories of soulmates. Two beings that the universe placed on the Earth who are two halves of a whole. For some, the Universe had chosen their soulmate at the beginning of time, before they were even created. Their souls were too important to not be destined to find each other. Their connection can defy the laws of the men and of Gods. It defies time and physics. It is the type of love that even immortals can spend their whole lives looking for but never find. The kind to move the stars. Cassiopeia's life has been anything but perfect. She has a power that no one has every seen in a god: The power to kill her own kind. She is coveted in her pantheon, the Atlantean Pantheon. But her power comes at a price. Can she find the one who can balance her even at her darkest? Will it be enough to stop the impending fate of the Earth that could end all life?