Star Rail x Fate Collab Event Is Dense Enough to Be a Fate Side Story
The event is reportedly supervised by Kinoko Nasu and treats Rin Tohsaka as its protagonist, giving the crossover the depth of a Fate side story rather than a shallow tie-in.
Reporting from 1 source: Automaton.
The second phase of the Honkai: Star Rail x Fate/stay night [Unlimited Blade Works] collaboration is underway. New characters Rin Tohsaka and Gilgamesh are implemented, and the Trailblaze Mission interlude Phantasm: Holy Grail War has been released. The event story, reportedly supervised by Kinoko Nasu, is dense with Fate references and centers on Rin as the protagonist. The event explains both franchises' basics so newcomers can follow it.
Rin Tohsaka is the Master and the Star Rail protagonist is the Servant, though the protagonist rarely appears in battle. The title Phantasm does not mean fake; it refers to a being born from the power of human wishes, the same idea that defines Heroic Spirits and the Holy Grail in Fate. Homages are scattered across the story, including minor enemies carrying small gags, and the event follows the Fifth Holy Grail War and mage lore closely enough that either side's players can follow it.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.