Arrow holes (stone) are narrow vertical slits in castle walls, wider inside for archers/crossbowmen to shoot while staying protected. They restrict enemy visibility, deflect missiles upward, and allow wide firing arcs with minimal exposure. Cruciform variants accommodate crossbows.
Cold, rough-hewn stone narrows to a knife-thin slit, flaring wide behind you. Dust motes drift through the shaft of gray light; iron-scented air funnels past your cheek as the cruciform gap cradles the crossbow’s tiller.