After unlocking the Glyph Door and accessing the Kassandra vault, you can find clues for obtaining the Blade of Yumminess in Assassin's Creed Shadows. Then, you must acquire some missing parts from various locations and utilize them to forge the blade.
Here are the details on how to get the missing parts and obtain the Blade of Yumminess from the Kassandra vault in Assassin's Creed Shadows.
All missing part locations in Assassin's Creed Shadows to forge the Blade of Yumminess

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While the whole process of finding the Glyphs and unlocking the door is quite a hassle, solving the clues inside can be mind-boggling as well. However, it's all worth it, since you'll be getting the Blade of Yumminess as a reward after finding the missing parts successfully.
Also read: A Puzzlement quest in Assassin's Creed Shadows
If you loot the Kassandra vault thoroughly, you can find the first missing part, Blade of Yumminess Scabbard. Next, you have to get three additional parts, and here are the locations:
1) Blade of Yumminess Blade

This missing part is located near the Mount Akaiwa viewpoint in Miyazu Bay, Tamba region.

From the viewpoint, follow the pathway going southeast for a while to find a broken bridge.

Then, look below to the right for the chest with the Blade of Yumminess Blade.
2) Blade of Yumminess Guard

To find this missing part, get to the Myoken Shrine viewpoint in Saika, Kii region.

From there, head towards the shrine's southeast segment and look below to find the chest. Loot it to obtain Blade of Yumminess Guard.
3) Blade of Yumminess Handle

To find the Blade of Yumminess Handle, reach the Onyu Pass Overlook viewpoint in Onyu Pass, Wakasa region.

From there, take a leap of faith and fall into the water. Next, dive inside and loot the chest to acquire the final missing part.
How to get Blade of Yumminess in Assassin's Creed Shadows

After getting the missing parts, return to the Glyph Door area and enter as Naoe. After getting inside, switch to Yasuke and navigate to the required location, and select the option "Reforge the blade."
After this, you will obtain the Blade of Yumminess (Legendary Long Katana) and Ancient Hero's Power (Engraving). You can then exit the vault by again switching to Naoe.
This concludes our guide to finding the missing parts of the Kassandra vault in Assassin's Creed Shadows to reforge the Blade of Yumminess.
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