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Basic Trope: Magic that concerns blood, usually as part of a thematic school of magic.

  • Straight: Charlie can sacrifice blood to generate Mana, and can use Mana to open bleeding injuries on enemies and steal the life energy contained in the blood that seeps out.
  • Exaggerated:
    • Charlie is joined by an adventuring party that can all use blood to empower themselves or unlock abilities.
    • Blood magic contains entire schools of magic within it, which have spells that do anything from remote blood transfusions to creating familiars.
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  • Downplayed: Charlie's most powerful spells have the option of paying blood instead of Mana, but it's not required and usually reserved for worst-case scenarios.
  • Justified:
    • Blood contains an unusual amount of magical potential, so enterprising sorcerers developed ways to access this power.
    • Charlie is a vampire, who naturally have this ability.
  • Inverted: Blood is magically sterile. It cannot be manipulated with magic, and spilling one's own blood is a good way to break a curse or enchantment rather than cast one.
  • Subverted: Charlie states that bleeding for magic is just important for symbolic reasons.
  • Double Subverted: Charlie is against an opponent who is somewhat superstitious, and he is trying to convince them to bleed themselves as well. They do, and Charlie is able to go to work on their wounds.
  • Parodied:
  • Zig Zagged: Magic is first introduced via Charlie drawing a glyph in blood, but then it's explained that the glyph is the important part... as long as it still has dying cells in it, and so most schools of magic teach mages to use their blood, as there's plenty of it and it regenerates. However, eventually Charlie is the first one to find out that saliva tends to be full of skin cells, and so he starts using that for smaller jobs.... though he still opens a wound to access his blood when he wants to be particularly dramatic or knows he's going to be doing a lot of magic.
  • Averted: There's a lot of functional magic, but none of it uses blood and the idea is never implied.
  • Enforced:
    • "The mature themes and swearing just brought our rating up to M for Mature... We may as well use that old design for Charlie where he drained the blood of his sliced up enemies."
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    • The work is a remake of an old video game where the player could Cast from Hit Points, and some justification behind it supposedly had to be added so that modern audiences wouldn't denounce it as a pointless gimmick..
  • Lampshaded: "I'll just bet you are the kind of person who'd amputate their arm to smack someone with it."
  • Invoked: "My innate connection to the Background Magic Field is weak, but with a good adrenaline rush, I get much stronger. If I'm going to be spilling my blood anyway, I may as well make it work for me, right?"
  • Exploited: Charlie's enemies use darts coated in blood thinners. If he dares to use his blood to cast magic, he'll find himself paying above the required toll.
  • Defied: In theory, it could be possible for someone to try to expend blood to be able to use more Mana - but no one does, and Charlie says that it would be a silly idea to injure himself when he could just drink a mana-restoring potion.
  • Discussed: "You're letting Lucretia heal you in combat? Does she siphon your blood to get her Mana back once you're out of danger?"
  • Conversed: "Why in the hell does Charlie bite his hand to use Mana Restore? Can't he do the same thing on his arm? Wouldn't all the scabs make his hand signs harder?"
  • Implied: Charlie's unique attribute is that he regains some Mana every time he takes damage, but there's nothing explicitly saying that he uses the blood itself from injuries to regain the Mana - for all we know, it may be the pain.
  • Deconstructed: If one's going to spend ages in a sedentary lifestyle, barely eating, drinking, sleeping, or exercising due to spending so much time obsessing over tomes and practicing spells, the last thing you'd want to do is draw your own blood to simply cast a few more.
  • Reconstructed:

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