I wonder why Gervasio didn’t just have one of his retainers fetch a set of silver clothing and just walk through that barrier. I highly doubt they didn’t bring a single set with them to the Sovereignty. Then again, they were already in the library, so it was probably faster to give it at least a try, before risking another discovery, should Raufen have ignored the order to stay in his dormitory.

Now the big question is, can Gervasio pass “Gramp’s” test of character. He seems to care mostly for his own reasons, rather than the good of Yurgenschmidt, so I think he should be booted out, but his motives weren’t clear enough to be certain. But even if he’s not allowed to meet Erwärmen, he can still fall back on using silver clothes to bypass the barrier, or try to force the current royals to register him as one of them to get through it, if they really don’t have any silver clothes with them for some reason, so the danger isn’t over either way.