A sword made from the blood of your enemies is technically possible.
If you separate the iron out of the blood of 300 adults, you could smelt it down to an iron ingot. This ingot would be enough to be used to create a longsword.
If you separate the iron out of the blood of 300 adults, you could smelt it down to an iron ingot. This ingot would be enough to be used to create a longsword.

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