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Let's do the math...
You can donate three times a year to the red cross (once every 112 days). According to some page, you donate around 10% of your blood volume each time.
That means, for a volume equivalent of 300 people, you'd need to donate 3000 times, which would take around 1000 years.
The vampire is going to need more people, or to keep a person alive 1000 years with vampire magic.
When you're harvesting the blood iron of your enemies you don't have time for ethics. A controlled study managed 4 weeks within ethical boundaries, maybe we can cut that in half unethically. So 14 days, 3000 . 14 = 115 years. So when you torture two people, you could manage to do 58 years. Better start early!
Orrrrrr capture the entire family of your foe and then you can name the sword something super cool about ending family lines
Maybe the sword is just the product of a small cult which drains blood to create it?
And then they do really cool cult stuff with the sword?
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The same blood bank? You sure that's not plasma instead of blood? Plasma re-makes itself way faster than red blood cells.
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Oh. That explains it. Normally in the US a typical donation is a full pint. Not a half pint.
You're off on blood production. "Safe" would be once every six to eight weeks for a pint. Plasma can be taken a lot more often. The red blood cells take a while to replenish.
But let's get real. You're not concerned about your enemy feeling well. Force them to take iron supplements and take a pint every other week. They'll likely stay alive that way. Fuck em, right?
But remember they are your enemy so you could drain a bit more blood more often to shave a few years off maybe
Slaanesh approves
Or just mix in a few enemies with some normal iron.
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Made with the blood of 100% real enemies!
But then you need to feed them iron-rich foods which could be used to make a vegan alternative instead, expanding your potential market.