Sariel is one of two final boss villainesses from the first Touhou Project old-age game, Highly Responsive to Prayers, alongside Konngara. She is an angel of death who is the final enemy encountered by Reimu on the Makai route, deep within Makai itself. Since she has no profile and exchanges no dialogue with Reimu, not much else is known about this boss character.
Sariel is a ghost-like angelic figure with white knee-length hair with seemingly blue eyes. She wears a long, simple blue dress with long white sleeves. She has six angel wings and holds a strange wand. She also has a weird jewel on her chest.
- Sariel's name means "Command of God".
- In Judaic and Islamic traditions, Sariel is the name of an archangel. However, some Judaic-Christian texts claim that Sariel is an Angel of Death, alongside Michael, Gabriel, and Samael. In other texts, Sariel is referred to as a fallen angel. Sariel is always depicted as being male, but the sprite is ambiguous enough to belong to either gender.
- In Coptic tradition, Sariel is thought to be the angel of the church of Sardis, referred to in The Revelation to John, and has an immense knowledge of magic, magic rituals, and magic powers that give him the ability to lead others astray. Fittingly, his/her second theme is called "The Civilization of Magic".
- Sariel's background changes throughout the battle: from a starry night, to a river with two floating yin-yang orbs, to what appears to be an inferno with human arms reaching out of the ground, and a collection of orbs showing Reimu and her shrine at another point in time.
- Sariel bears a striking resemblance to a nameless Story of Eastern Wonderland Midboss.
- Sariel is the first character to have more than one theme.
- Additionally, Sariel is the first character in the whole series to appear in a silhouette. Sariel appears in her second form.