Dark One's Dagger
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- Merlin used the Flame of Prometheus to reforge the Holy Grail into Excalibur
- Nimue smashed Excalibur, severing the tip from the rest of the blade
- Merlin fashioned the broken tip in a dagger, binding the Dark One to it
- Whoever held the dagger control the Dark One
- If used to kill them, the killer became the Dark One
- The name of the current Dark One was engraved on the blade