Arc 9The Holy City and the Grail War
Horace sent Messmer to burn corruption in the Nasuverse while the Tarnished pursued quests across the Lands Between. As the Fourth Holy Grail War began, Messmer saved Sakura and confronted Zouken, while Proto Saber worked to protect Illya and Irisviel, and Shirou offered to become Cú Chulainn’s Master.
- Horace helped Hötter contain her powerful soul and develop her own moon, while Ranni watched with a sense of betrayal.
- Horace chose Messmer to act as an angel in the Nasuverse, and Messmer burned the corrupt Temple and its accomplices in the first-century Holy City while sparing those who prayed.
- The Tarnished befriended Yhorm, helped Adam recover Iji’s Medallion, and learned that Yhorm carried the Fell God of Fire’s flame.
- Miquella wrote a horse romance inspired by Radahn’s advice, and Godwyn arranged to spread it across the Lands Between.
- The Tarnished became Sellen’s apprentice, while Horace assigned Volcano Manor to Messmer and sent Rykard to help Mohg at Stormveil Castle.
- The Fourth Holy Grail War began as Kiritsugu summoned Proto Saber, the other Masters summoned their Servants, and Messmer appeared to protect Sakura from Zouken Matou.
- Messmer and Horace separated part of Zouken’s soul and sealed it in a book, and Makiri Zolgen agreed to teach Sakura basic magecraft.
- The Tarnished hunted Flying Dragon Cosmil with Eleonora and Yura, then later joined Eleonora against Mohg while Yura set off to find her.
- Proto Saber rescued Illya from the Einzberns’ plans, sealed Avalon inside Irisviel to protect her, and heard Shirou ask Cú Chulainn to accept him as a Master.