Unholy Grudge

After the prodigious warrior Theo and his allies find the tomb of the last hero, they rejoice, finally being able to claim a holy blade with which to defeat the dark lord. However, it seems the ghost of the blade's last wielder has some bad news.

This story was spawned from a reddit post by FennecWF on r/WritingPrompts.

Original prompt: Only one of pure heart can remove the Holy Blade from its sheath and wield its true power. But that didn't stop one hero from defeating the Evil Emperor with it.