Blood Fort Andromeda

By using her blood as a material component, Rider is able to create a crimson dome-shaped barricade around her foes. Victims trapped within this enclosure are dissolved into a slurry of blood and organic ooze, which is later absorbed by Rider as Mana. Although such a Noble Phantasm is effective at cutting off escape routes for fleeing enemies, its primary function is the accumulation of Mana. Use of this Noble Phantasm damages the Mana circulation of an area, limiting its usage in a single area. Andromeda is the name of a princess who married Perseus, a son of Zeus and the slayer of Medusa.

Addtional source: Fate/Stay Night game translation v1.0a by Mirror Moon