[He'll just give a really smug sort of shrug at that!]

I am aware of that, yes-but, of course, even the heroes that were theoretically immortal are remembered for the fact that they died despite that. If we can puzzle out all the other Servants' identities, we can bypass the abilities protecting them.

As for the masters... well. Doesn't that wall you are talking about lead to hubris?

[...KAYNETH IF YOU WERE AT ALL SELF-AWARE]