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Two questions regarding Weapon Refinement
1. Let's say I want to upgrade Merric's Excalibur to Dark Excalibur. Would I still be able to equip the normal Excalibur afterwards?
2. What stage do you need your weapon to be for inheritance? Is it possible to inherit a Killer Lance + and then upgrade it to the Slaying Lance on the second character, or do I have to upgrade it to a Slaying Lance first before inheriting it?

Fate Grand Order
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