"Someone in my lair?" a draconic voice says from above him, as he enters, the harmless, combined Magic Mouth and Alarm spell triggering automatically, as he enters, both letting him know he's been observed, and telling the dragon, deeper within, to observe him. A few moments later, as he's progressing deeper, he can sense the dragon's scrying attempts, though, unless he allows them, they bounce off of his spell resistance. When he finally gets close to her lair, though, the illusory dragon sitting on the pile of coins peers at him, the real dragon hidden in an illusioned alcove, nearby. "And who might you be?" she asks, as he walks in.