Last session, when the Deft character with a ring of invisibility and an enchanted rapier rolled a critical hit on...

Last session, when the Deft character with a ring of invisibility and an enchanted rapier rolled a critical hit on the living statue, he said "There's a 95% certainty the statue will die now." The other players dubbed him the "Mathemortician".

When the same character wanted to bury a fallen PC by encasing him in molten iron, the suggested affiliation group to learn this skill was the "Burial Smiths." That's how the Referee learns new things about the world.