They are the Hallows of Britain.
They are 13 ancient treasures: mysterious, magical, infinitely powerful, with the potential for great good... or absolute evil. The legends of some of the Hallows are well known - Arthur’s sword, the Grail Chalice, the Stone of Scone - but most of the others have been lost in the mists of antiquity. However, the 13 Hallows survive, protected by hereditary Guardians who can trace their lineage back to the age of Arthur and beyond.
The Hallows have been used time and again in the battle with the Demonkind who once ruled this earth. The last time the 13 Hallows were gathered together was in the time of Arthur, when they were used to drive the Demonkind from this world and seal the entrance between this and the Otherworld. The battle cost Arthur his life, and with his death, the age of the knights passed and the Hallows were dispersed into the safekeeping of the Guardians, the direct lineal descendants of those who carried the first Hallows. The sacred objects have remained with those families for more than two millennia. Now someone is gathering them together.