Something I've been curious about is if/when the players of SAO realize that the Magecraft they learned in the game is real will we see a situation where Shirou, Illya, and the Eastern Mage's form a new break away Organization of Spellcasters
(the Type-moon technical term given to those who use Magecraft without following the way of the magus, such as Kiritsugu Emiya and Flueger who treated Magecraft as just a tool. Usually, their general skill with Thaumaturgy is low, but it is not uncommon for them to be highly proficient in a single field that they choose to specialize at. Also includes mages who lack formal training such as Shirou Emiya and Sakura Matou.)
Similar to the scenario in Fate/Apocrypha where the Yggdmillennia family split off from the association, though the circumstances are obviously different.
The way I see it, if they didn't band together and form a new eastern society for Spellcasters or reach some sort of agreement with the Clock Tower they would likely be killed off by the Enforcers one by one until everyone involved with Kayaba's SAO experiment was eliminated to protect the secrecy of Magecraft.
Also when I re-read the fic up to chapter 62 When the OC Leviathan is introduced it got me thinking about the possibilities for someone with the "Blood" element. I went to Superpower wiki and typed in "Blood" and the list of possible powers and abilities associated with it were surprising. Here is just some articles that I found on the wiki you might find interesting.
Cardiology Manipulation via Blood Manipulation
Blood Pressure Manipulation
Blood Property Manipulation
Bone Manipulation: Blood is produced in bone marrow.
Thermovariance: To boil targets blood
Adoptive Muscle Memory and/or Knowledge Replication using blood as a medium to access things like Genetic Memory.
Dermal Armor by increasing the density of one's own blood
Blood Marionette (via injecting his own blood as a medium into the target)
Neurocognitive Deficit by reversing the flow of blood to cause unconsciousness.
Blood Creature Creation
Pain Inducement (via injecting his own blood as a medium into the target)
Paralysis Inducement (via injecting his own blood as a medium into the target)
This was something I composed in a message a while back but never got a reply on so I was wondering what everyone's thoughts were regarding these ideas.
Well, some of them are either impossible or very complicated in this scenario, as Nasuverse is relatively high up in the Sci-fi hardness scale. For example, making his blood denser? That would also make it heavier, and significantly harder for his heart to pump. He could get around that by manually (magically) pumping his own blood for the duration of such a spell, but it would likely be ridiculously painful, dangerous, or both. So basically, it would be Nasuverse magecraft. Toxic blood? Well, possible, with a clever use of Reinforcement. That said, doing it to your own blood is a terrible idea, and doing it to enemied dounds great until either anyine attacks them and gets them to bleed out toxic blood or they just plain simple coff toxic blood at you. I do like the Blood Link and Blood Marionette options (by directly controlling his opponent's blood, even if he ends up using a small part of his own blood as a medium), I feel he could probably make an interesting, voodu-like personal style of magecraft. I do think Leviathan and Kuradeel would make good partners, I mean, blood and scary-ass monsters, a match made in slasher flicks.
And as for Enforcers killing the SAO survivors one by one, the power match-up between SAOers and the Clock Tower has been debated back and forth like, a million times on this thread already to no achievable consensus, but suffice to say the Enforcers won't have it so easy as that.
uhm note i want to add to the "toxic blood is a bad idea" notion.
it does seem stupid at first, but you could go the mithradatism route, and slowly build up your toxins while getting your body adjusted your blood composition.
basically: Poison blood is possible, just slow to execute. also: How do you intend to get your blood into THEIR bodies? i mean thats logistically impressive at least.
maybe poison darts?
Also: Is there any reason why he would only be able to controll his OWN blood?
because if there isnt could he do some origin-bullet type stuff with blood instead of bones?
-Edit- I realised another logistical method of weaponising ones own blood. would need Ilya's help (her families skills with homonculous craft) and a transhumanist effort.
i read that the mythological children of Tiamat had venomous blood once. which Always made me wonder VENOMOUS blood? don't you mean poisonous? but if he got somekind of transhumanism thing going, and had like poison-sacks like a cobra installed that would work.
it wouldnt be great, (limited use. every attack would sacrifice some of your blood. so attacking to much would kill you by anemia.) but at least the idea of toxic blood can be weaponised. it'd be a great trump card in a fight, but limited use.
also: When kariya inevitably brings in phantasmal beasts in the game, is Leviathan going to go Sigfried? (the "empowered through mystic-blood concept, not the involnerable concept")