Petrified

Caught in the act, this thief was petrified, turned into the very metal that he coveted. He stands now at the entrance to the museum, as a warning to all who might dare to follow in his footsteps: "Don't steal from a Wizard."

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You can thank @Kyubeon for this image being put up here, I had to change some parts to make it suitable for upload, and I only did so at their suggestion.