[ he sees her expression, but the nuances and... well, politics of fighting in the grail war are complicated, and not easily explained, and its not like he has no free will of his own in it — his master just has an absolute way of controlling him if they wish it. the rest of the time, he benefits from the contract just as much as she benefits from having him fight. usually. ]

It is part of the Holy Shroud of a saint. [ technically its a conceptual weapon, but whatever! ] Where are you headed? I need to be nearby for it to remain materialized, but I can accompany you.