The Black Tyrano is a monstrous enemy creature found in 65,000,000 B.C. in Chrono Trigger. He is the "boss" enemy the player must defeat in the Tyrano Lair.
When Crono's party confronts Azala in the Tyrano Lair, Azala unleashes the Black Tyrano on them. The creature is ultimately defeated.
Chrono Trigger DS - Boss 14 Azala and the Black Tyranno