Talk about it here.
Tardelli was an artist exiled from Panamore. His work warped space and altered those who viewed it. The Eighth Doctor often destroyed his works after he managed to get him discredited by the Pope. He was summoned by the Headhunter after she obtained the black diamond, which contained a pocket universe, he was hiding inside and ruling over. The Headhunter offered him a job as the court artist of Emperor Vassilar-G of Ralta. (AUDIO: Grand Theft Cosmos)