Perhaps it was because Amberser's own experiences were already legendary enough that most people tended to overlook his background.
Moreover, Amberser had always showcased his own wisdom, the eloquence that could cause even the Gods to fall, rather than any formidable power or profound background.
This led everyone to subconsciously ignore his "background".
If a Lich could wipe out your entire family with just his words, would you care who stood behind him? Was it important?
Even Selwyn, a novice student, felt the same way.
Understanding one's mentor, starting from the mentor's words, actions, and past deeds, Selwyn had never bothered to inquire about Amberser's connections. Not to mention the relationship with the God of Alchemy, few people even knew about the Elegy Poetry Society in Amberser's history.
Now that Amberser had revealed his identity himself, Selwyn was so shocked that he was left speechless.