An immortal monarch discovers their kingdom faces annihilation from the Cadence, a plague of otherworldly creatures whose lethal touch poisons the very ground they traverse. A mystical artifact called the Massive Chalice reveals a grim truth: three hundred years must pass before it accumulates enough power to purge the land of corruption. Bound to the throne and unable to take up arms directly, the ruler must instead cultivate bloodlines across generations, strategically pairing bloodline keepers to birth increasingly powerful warriors capable of holding back the invasion until the Chalice's salvation arrives.