shroud of martin
Holy Shroud given to Emiya Shirou by Kotomine Kirei during Fate/stay night: Heaven's Feel. He wears it as bandages wrapped around his left arm, which has been replaced with Archer's after he was attacked by the shadow. A similar red igote is featured in the design for Senji Muramasa in Fate/Grand Order, but this hasn't been confirmed to be the same shroud.
Not to be confused with the Shroud of Magdalene.