Dio Calmis

About
Dio Calmis was a tousho that was sleeping in the Toushin Toshi Upsilon. Among the created Tousho, he claimed to be the strongest of all. He was a famous assasin whose name could shake the world when he was still human. He felt great pleasure in killing.

He lived in the era of the Dark Lord War but was sealed by Freak Paraffin because he was deemed as too dangerous.

Rance IV
In Rance IV a Helman Squad led by Bicchi find his sleeping body and re-awakened by Shizuka Masou, although not before hiding several bombs within his body. With the threat of instant-death with the explosives, Bicchi convinced Dio to follow him.

He chased after Rance's party a few times in the Toushin Toshi but they managed to escape every time.

He later encounter Replica Misly and engaged in a brief fight against the Tousho, which Dio won with ease due to the big difference in strength.

Eventually, after Bicchi was killed by Toushin Upsilon, he fought against Hubert and Freak Paraffin. They were unable to defeat Dio and he was about to kill them until Hunty Kalar showed up. Dio underestimated Hunty, laughing at the thought of a Kalar being their "savior", oblivious to Hunty's true power. He was defeated by Hunty and presumed dead at the fall of the Toushin Toshi.

Abilities
Dio claimed to be the strongest Tousho and he wasn't bragging. His strength in physical combat was terrific, even for Tousho's standards. Rance's party fought him and was forced to retire several time to the point they didn't want to consider fight him again.

He could also defeat with ease Replica Misly, another Tousho and with a level skill for fighting. Hubert and Freak were also unable to defeat Dio. The only that could take on him was Hunty Kalar, who by herself is one of the world's strongest mages and one of the most powerful characters in the setting, which says a lot about Dio.

He has a Lv2 skill in Kenpo and a Lv1 in Sword Combat and Guard. His level and cap are unknown but are presumed high.

Dio's most unique and impressive talent is his high magical endurance, Tousho are usually known for being weak against magic due to their low magic resistance, but that isn't a problem for Dio. Magic damage can be reduced with a strong enough mental fortitude, Dio is apparently able to ignore the feelings of pain and greatly reduce magic damage.

He was the ultimate assasin of mages whose strength in combat seemed to lack weaknesses, and given his personality, it's no surprise he was put to sleep for being too dangerous.