Characters: Saint Sasha, maybe a companion or a mentor? Or she's alone. The Scarlet Demon could be personified, perhaps with some tragic elements. The stone itself could have its own properties, like a heartstone or soulstone. Maybe using holy relics or incantations is part of the solution.
Alternatively, maybe the stone is a powerful relic that the Scarlet Demon uses to control areas, and Sasha must destroy it to liberate the people. There could be a twist, like the stone was misunderstood or had a trapped spirit that needs to be set free, requiring a sacrifice from Sasha.
Since the original example ended with "the Crimson Blade: A Tale of Redemption and Vengeance," perhaps the user wants a similar structure but with "Free..." perhaps completing the title. But maybe the user wants the title as given. Let me go with the given title and create a story around it.