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- Yue from Cardcaptor Sakura As a being created from the moon (And the moon being able to only reflect power) he is in danger of ceasing to exist because Sakura is too young to generate enough magic to support his existence.
- In some way, this could be said of the majority of the Magic World's denizens in Mahou Sensei Negima!.
- There are several classes of living sentient beings made of pure magic in the Lyrical Nanoha series:
- Familiars are created when a powerful mage infuses a dying animal with their mana, giving it sentience and replacing its physical body with one of pure magic. To continue existing, the familiar must be continuously fed with more mana by the master.
- Unison Devices are magical constructs with AIs sophisticated enough to count as characters independent of their wielders. Some Unison Devices even verge on the Our Phlebotinum Child territory.
- Living Programs are perhaps the most obvious example: sentient humanoid constructs created from magic by a powerful magical artifact, such as the Book of Darkness, which created the Wolkenritter in A's and their replacements, the Materials, in the PSP Alternate Continuity. In A's, the Wolkenritter disappear into light where drained of their mana, and their nature becomes a major weakness in Force where they are vulnerable to the Eclipse infectees and their dividers. Signum is in the hospital for months thanks to Cypha tearing her to shreds.
- The mazoku in Slayers are primarily astral beings, so their physical manifestation is only a projection amounting to a fraction of their true power. Also, since the astral domain is ruled by Psychoactive Powers (being the domain of the mind/soul) this gives them the ability to be directly bolstered or harmed by emotions, and the Weaksauce Weakness that the harm to their ego caused by fully acknowledging more powerful beings could literally cause one to disappear in a Puff of Logic.
- In The Second Chronicles of Thomas Covenant:
- The Elohim people are Earthpower incarnate.
- Covenant himself is transfigured into a being of pure Wild Magic at the end of White Gold Wielder.
- Simkin from The Darksword Trilogy
- The fairies from The Last Rune series by Mark Anthony. When they travel to Earth, where magical power isn't nearly as common as on Eldh, they suffer horrific pain and slowly die unless they take special drugs.
- The gods in Trudi Canavan's The Age of the Five.
- Many of H.P. Lovecraft's Eldritch Abominations, including Cthulhu, Azathoth, and certain avatars of Nyarlathotep.
- The Dresden Files:
- Most of the non-humans that Harry Dresden encounters are Fae, beings made of Ectoplasm and magic. Because magic is so intrinsic to their nature, they have perfect control over their use of it, unlike wizards. Wizards have spillage, and so they can't use modern technology because they short it out. The world simply doesn't like Harry Dresden.
- It's unclear if Angels and Demons (which do exist) are made of Soulfire and Hellfire, respectively, or just use it as a power. Because both of those magics are fueled from one's soul, they would be perfect examples of this trope.
- Spren in The Stormlight Archive. Though very powerful in their own Realm, they are mindless in the Physical Realm unless they find a human to bond to. Such a bond lets the spren use the human's brain and the human use the spren's powers.
- Espers and the Ultima Weapon in Final Fantasy VI. You can actually kill Ultima Weapon by draining its MP to zero.
- Several normal enemies (generally with a consistent techno-organic design scheme) also follow this, down to dying if their magic points are zeroed out.
- The Big Bad of Neverwinter Nights 2, the King of Shadows is a creature of pure shadow weave magic.
- Big Bad Pain Elemental Chzo of the Chzo Mythos. He'd actually die of magical starvation if he ever crossed over to our dimension since there isn't enough magic to sustain him.
- The "Aggregate Sentiences" in Tales of the Abyss are this, and since the same spirits show up as summons in most installments of the Tales Series, it's theorized that this is the case for other instances of the spirits as well.
- Ghosts and other strange things in Atelier Series games effectively have 0 HP, but they will, uh, die when they have 0 MP. It's possible for a ghost character —such as the recurring character Pamela— to, well, kill themselves by casting spells that require more MP than they have.
- Xerath is League of Legends performed a ritual to turn himself into one of these, as a human body was limiting his power.
- The Fae in Kingdoms of Amalur: Reckoning are described as beings of pure magic. This actually works against them — the Prismere that empowers the Tuatha warps their minds due to the Prismere screwing with the magic within them, which is why all of them are such brutal destructive warmongers. Mortals on the other hand can wield Prismere with no ill effects.
- The Shantae series has the full genies, who are beings made of pure Light Magic. The reason why full genies no longer exist is because they drained themselves of magic in the past to defeat a threat, forcing them back to their Magical Land as they could no longer sustain themselves in the physical world.
- The Monsters in Undertale are mostly made of magic, which attunes them to their SOUL. This is makes them physically weaker than humans, as they die when attacked by someone with enough ill will, but they can become much more powerful if they absorb the SOUL of a human. When a monster dies, their body turns to dust.
- In Guilty Gear: Revelator, it's revealed that Axl Low and I-no are both "magical foci", basically bundles of sentient magical information.
- The nether demons are made out of pure nether Mana, a far more potent version of the energy Fae use for sorcery. They exist in alternate universes, that any summoner with proper training can open a gate into and unleash them onto the world. These demons have no physical form and typically are unintelligent, spending all their time in the physical world feeding off of mana and auras of the plants and animals around them. They are feared and hated by most Drow, as demons also having the nasty habit of invading the bodies of aura bearing creatures, either simply tainting them, or taking over their entire body and killing the host, well twisting it into a mindless creature that attacks anything nearby.
- It is revealed later in the series that the audience and readers of Drowtales are in fact also demons, which can only be seen by Kiel.
- The enchantress Mara, from the 1981 cartoon series Blackstar.
- One episode of Disney's Aladdin TV series featured Genie being hunted by a magic-eating creature.
- On Gargoyles, Goliath describes the Third Race as "beings of pure magic." Their ruler, Oberon, is basically a Physical God, and even Puck manages to shapeshift an entire city twice in one night.
- In Ben 10: Alien Force, Anodites are Made of Mana, essentially making them lesser Reality Warpers without casting any real spells. In very much the same vein as the aforementioned (but obscure) Faltine of Marvel comics.
- The Father, the Son and the Daughter in Star Wars: The Clone Wars.