Oh great. Magic ghosts. Or projections. Or mind trickery. That opened up a slew of potential dangers just waiting. And he was friendly. Friendly plus ghost/trickery/projection was even worse. I mean sure, it COULD be a real living person that popped up in thin air. Could be. But Galatea was pretty certain it wasn't. No one was that... Chipper...
"I am an Adamantine. The magics of this place are likely responsible for disturbing the normal wildlife, and it falls upon me and mine to ensure the powerless are not harmed. Please explain the function of this Sanctum."
Nothing in there was a lie, so Galatea wouldn't have to convince the thing of anything. Which was good- because Galatea sucked at lying. Best to stick to simple and precise.