Well, a lot of people has considered it to be a cameo included in the OoX by Capcom. But since it doesn't have the same name, it is not a cameo-MS but another legitimate sword.

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Levyn, Sheikah keeper of the Triforce. Not of this world...

Roses are red, violets are blue
Link is green... in some games

- PROTECT THE HOMELAND.
Hail General Humulos!