Elliot had already asked about the ritual's entire procedure in advance.
The so-called "ritual that would allow him to come into contact with concealment" was essentially a twice-simplified version of the Immortal Ascension Ritual.
The Investiture Ritual Vanessa had undergone on her visit to the Imperial Palace was a once-simplified version, which could turn an ordinary person into a noble.
Elliot's ritual simplified it once more, its purpose being to gain the family Secret Library's recognition and allow him to formally inherit the Sterling surname.
The Secret Library was not merely a room full of books, but a place where the family stored relics and secret histories. Even entering it required one to be above Middle Rank.
Anyone who had not reached Middle Rank could still enter with the family head's permission, effectively taking a back door.
In fact, if Elliot inherited the ducal title and was formally invested, he could even skip this ritual altogether.
As the family head, he would naturally receive its recognition.
Once the Secret Library recognized him, Elliot would be able to come into contact with secret histories in relative safety, with his spirituality suffering almost no major shock.
As for why its recognition would allow him to come into contact with secret histories... unfortunately, that itself was also a secret history.
But he would automatically learn the answer once the ritual was complete.
So, as Elliot understood it, in plain terms, this ritual amounted to him going over and leaving a handprint, then the Old Duke stamping it to signify his approval.
It was that simple.
The only troublesome part was that the Old Duke had to apply the stamp himself, because the Secret Library only recognized the family head's written orders.
And now they were telling him one person could not apply this