Caster (Fate/Crossover - Patchouli Knowledge)

**Caster** (キャスター, *Kyasutā*) is the servant of ??? in the ??? Holy Grail War.

"*The essence of magic is to determine the root cause of all things. There's no distinction between science and magic.*" - Patchouli Knowledge

## Profile

### Identity

Caster's true identity is **Patchouli Knowledge**, a very smart, asthmatic magician from the Scarlet Devil Mansion. Although she has only been a boss in one game, and playable character in three others, she is still a very popular character, showing up in many endings and is referenced quite often. She spends most of her time in the mansion's library reading and writing magic books. It seems that she's capable of very powerful magic of all kinds, using many elements in a single spell, but due to asthma and general poor health, she's often unable to recite her spells.

### Personality

She doesn't have a very proactive personality, but rather always walks her own path. However, she's always interested where knowledge is concerned and will proactively go and try to acquire it. She does everything by the book, but still makes a lot of mistakes. She's also described as very dark and taciturn. Dark doesn't mean "evil", it just means she likes to keep to herself and doesn't interact well with others. Taciturn means she's silent in expression and manner.

## Abilities

Patchouli using the "five elements" makes her an "Eastern style Western magician", an antithesis existence to Marisa Kirisame: "Western style Eastern magician". Patchouli is able to handle the five phases with the addition of the sun and moon elements. The five elements she is able to control are fire, water, grass, metal, and earth. In Embodiment of Scarlet Devil, she had the peculiarity of using different spell cards depending on the player's character and shot type (a recurring gimmick in many stage 4 bosses of the Touhou games). Patchouli has many books that are in the library of the Scarlet Devil Mansion that's mostly used for magic. Some of these books appear to act "independently" and can shoot bullets, as shown in Stage 4 and Extra of Embodiment of Scarlet Devil. Presumably, because of this, there's a recurring joke in Everquest about the books in the mansion being armed with guns.

### Noble Phantasm

#### **The Castle of Red Mist – Scarlet Devil Mansion**

The mansion where Caster and her library resided nearly her entire life. Within these halls lie ever-changing corridors, an assortment of fairy familiars (that also act as maids) and rooms of all kinds. This location was home to many powerful figures within Caster’s legend, but only the master of the mansion would be able to bring them along with her were she to be summoned. In fact, the only reason she is able to summon it at all is because she is more closely connected to a location in the mansion – her library – than to any of the residents. As it stands, Caster is only able to summon her familiar, a devil who goes by the name Koakuma.

Able to be summoned at any time, although having the Library already summoned drastically decreases the prana cost, as that is the location where Caster is most associated with, and thus holds more significance to her and her legend than any other location. Already having the Library constructed not only provides an anchor for the rest of the mansion to come into being, but also means that the most prana-heavy part of the building is already complete, making the process of bringing the rest of the mansion into the world much easier.

If the Servant summoned were Remilia Scarlet, the master of the Scarlet Devil Mansion, she would be able to control the ever-changing corridors and fairy staff. Unfortunately, because Patchouli was summoned instead, these corridors and fairies are unable to be used reliably for plans.

## References

https://touhou.fandom.com/wiki/Patchouli\_Knowledge

https://hero.fandom.com/wiki/Patchouli\_Knowledge

https://themultiverserevamped.fandom.com/wiki/Patchouli\_Knowledge

https://forums.spacebattles.com/threads/summon-a-servant-mark-vi-the-dark-six-f-sn-crossover-servants.370875/page-129#post-38046540