Ruining the mystery/First thing taught in Paladin school

So during my first dnd campaing, which was Castlevania based, I was playing Paladin of the Church, which led to the following bit, just as we entered the castle:

Dm: …And to the left, you see a hooded man sitting on a flying carpet, playing a gold fiddle

Ranger: I go to say “Hi, Im Kaito, who are you and what are you doing here?”

Mysterious hooded: Hello there travelers, we dont get many visitors around these parts, my name is Light and I’m but a simp-

Me,half jokingly half serious: Oh, hey nice to meet you Lucifer, kinda surprise you’re here.

DM: ……….so the man just sighs, and reveals himself as Lucifer, former prince of darkness, and former ruler of castlevania

Warlord: Wait doesn’t he have to roll or something to know?

DM: He’s a Paladin of the Church, The first thing they teach you in paladin school is about Lucifer, that it means Beautiful Light and his betrayal……There was going to be this whole bit of his identity being revealed later, but that’s scrapped.

Me: Well you shouldn’t have named him Light and given him a golden fiddle

 And that is how Lucifer joined us in our adventure to defeat Dracula