Altria Caster

Altria Caster (アルトリア・キャスター), also known as Castoria, is a premier Caster-class support Servant in Fate/Grand Order and a central protagonist in the Lostbelt No.6 story chapter. Unlike the traditional King Arthur version of Altria, she is the “Child of Prophecy” from the Inner Sea of the Planet, Avalon, dispatched to the British Lostbelt to ring the Bells of Pilgrimage and forge a holy sword to save the land. While she maintains a cheerful, energetic, and hardworking exterior to meet the expectations of those around her, she internally struggles with deep-seated pessimism and an “abject” self-image due to her “Fairy Eyes,” which allow her to see through all lies and human/fairy malice.

In gameplay, she revolutionized the “Arts meta” by providing unparalleled support through her kit, which includes a 30% party-wide and 50% single-target NP charge, Arts performance buffs, and NP gain increases that enable consistent Noble Phantasm looping. Her Noble Phantasm, Around Caliburn (and later Hopewill Camelot), is uniquely powerful for providing “Anti-Purge Defense,” a special type of invincibility that cannot be bypassed by standard “Ignore Invincible” effects. Physically, she appears as a 154cm tall girl with golden hair and green eyes, often seen wearing a fantasy-inspired military uniform and carrying the Staff of Selection. In her final ascension, she transcends her identity as a village girl to become Artoria Avalon, the personification of the holy sword itself.