If an antihero - a villain of their story, in other words - is absorbed by the Grail, it will become corrupted. It will take on a will of its own, deliberately interpreting wishes to its will and against the victor.
(shrugs)
I'm really not sure. Just - maybe she doesn't want us to bring the house down, or anything.
(Wheezes and nods vigorously at Gen.) Y-yes, you're—...! Uhhhm... Well—well probably, possibly robots still maybe count because—because, uhhhm, they—... robots can die, I think and—and humanity makes them, so it's—... i-it's common sense, I think...
(Blinks at Lust.) ...Uhhhm...? It's— I— probably, if I, uhhhm, re-explained the things, it would be more—more sensemakeable, or somesuch, and—...
(Looks down, wheezing deeply.)
...Uhhhm... What... What was it I was... saying...?
make it through this year if it kills you yet | 2001-2019

Main Room
Homura: ...Hmm. What changes does she have in mind?
The damned queen and the relentless knight.