Blood Fort Andromeda: Outer-Seal, Blood Temple (他者封印・鮮血神殿ブラッドフォート・アンドロメダ, Tasha Fūin - Senketsu ShindenBuraddo Fōto Andoromeda?) is the Temple of Blood that surrounded the Shapeless Isle which was the home of Medusa and her sisters, turning it into a palace of darkness, dyed crimson from blood, where the sun didn't shine. Medusa is able to implement it as a Bounded Field of blood that she uses to primarily absorb magical energy by dissolving any caught live humans and reducing them into red blood and organic ooze.[2] Using her blood as a material component, she sets up a number of sources around an area, taking the form of magic circles placed as predetermined points, to slowly build up energy without leaving a single trace of her existence.[1] It is impossible for Rin to completely destroy it as new circles constantly appear and old ones are restored. She can only delay its operation date by constantly removing as many circles as possible. It takes over ten days to completely store enough energy to activate the full power of the field, but it can still be activated at any time once the foundations are complete. It damages the leylines of the area once it is completely set up, so it cannot be reactivated on the same land twice in succession.[2] It leaves a general listless feeling around the area, and Shirou senses the barrier by seeing an image of the area covered with membranes and the people looking like empty dolls while smelling the sweet scent of honey from an insectivorous plant.

  • The Temple of Blood on the Shapeless Isle
  • Students in Shirou's school being drained of their energy
  • Blood Fort Andromeda's Magic Circle
  • The Magic Circles placed around the school
Immediately following the placement of these circles, people within the affected area will only have their life force sapped slightly.[1] Once activated, it forms an advanced Bounded Field almost on the level of Magic. It creates a crimson dome-shaped Bounded Field resembling a gigantic red eyeball around the area of operation, and it tints the area in crimson red that makes a person think that blood is seeping into their eyes.[2] The barrier acts like a separate plane that completely cuts the affected area from the rest of the World, cuts off all escape routes for fleeing enemies, and Rin is left unable to contact Archer. Naturally. from outside the Bounded Field, the area appears normal as usual and the red sky and dome cannot be seen at all, but the interior is stained with blood, as its name suggests. Victims within the barrier are quickly dissolved into blood as if they were inside a stomach upon activation, and its magical energy is given to either Medusa or her Master.[2][1] Those with a proper amount of magical energy or with knowledge of thaumaturgy are able to resist the Bounded Field, such as a Servant or a magus respectively, but those without any are instantly drained. Even then magus can only resist Blood Fort Andromeda for a short amount of time. Thus, it is not a Noble Phantasm to be used for combat, but rather a Bounded Field created by Medusa to efficiently gather blood to drink for mana.[1] If the Bounded Field is activated without the proper energy, it can take up to a number of minutes to completely dissolve the victims. If Medusa has a stronger master, such as when switching from Shinji to Sakura, the effect of the field will also become stronger. It is completely controlled by Medusa, and it will continue to stay active even after she dies. It will only be deactivated through her own will or once her body dissipates.

Those under the effect of the weakened barrier almost instantly collapse unconscious and begin to convulse and foam at the mouth due to the dense air. Stronger people can resist it for a small amount of time, while weaker people will instantly have their skin start to melt, have inflammation resembling a keloid, and their eyes will look like those of a dead fish. Those closest to the origin of the barrier will suffer the most severe effects, such as their blood being instantly vaporized and having the look of pale wax dolls piled like corpses. Someone with a slight resistance, such as Shirou, will feel nausea, dizziness, a sensation of being extremely hot, and instant discomfort as if their senses were revered. They will have trouble breathing as if the oxygen had suddenly dissipated. If the barrier is removed quickly enough, those furthest away from the origin will wake up as if they were sleeping and get away with a stay in the hospital for what amounts to severe malnutrition and slight memory loss. Those closer to the source however will suffer from side effects from having their life force drained, including scars and necrosis on the tips of their limbs from the melted skin, physical disabilities such as being on the verge of blindness, and mental scars from oxygen deprivation.

It was shown in the Heaven's Feel route that Blood Fort Andromeda can affect servants as shown when it began to drain mana from Archer. This however mainly ocurred due to his weakened state having been petrified by Rider's eyes. This shows that Blood Fort Andromeda can drain the mana of servants best when their under a weakened state even though they have the ability to resist the Blood Fort Andromeda with their magical energy. Leaving mainly servants such as Caster or Berserker who both have large stores of mana to be able to resist Blood Fort Andromeda for a long time.


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