What or who is Ćroí Dàn, the Heart of Destiny?

The Mother Goddess, Danu, created Ćroí Dàn (pronounced Kree Dawn), also known as the Heart of Destiny. Ćroí Dàn is a heart-shaped ruby pendant that endows heroes of the land to rise above their mortal beings, become true defenders of Erin, and rally clan warriors to their cause. To be claimed as Erin’s Hero. Breanna is just the sixth Hero to be claimed by Ćroí Dàn in over two thousand years. In the moral world, she can only see or hear through her chosen Hero. Because she can cast inspiration across the land, Badb Catha wove the Heart of Destiny to be the vision caster of the Triple Dàns. Thus, the three magic relics allow Erin’s Hero to envision a timeline through the Stone of Destiny, and the Blades of Destiny pass that vision to the Heart of Destiny to cast it over the Emerald Isle.