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What you have heard here, Nightwatcher, will never leave this tower.
~ General Mono's words to Raphael in the video game
General Mono is a major antagonist in TMNT. Mono was one of Yaotl's generals until he and Yalta's other three siblings were encased in stone. Three millennia later, he was revived by Yaotl.
Mono was born around 1000 B.C. somewhere in Central America and grew up in the Aztec army alongside his brothers Yaotl, Aguilla, Gato and sister Serpiente to become merciless tyrants leading a massive army into conquering every kingdom of the ancient world. Known to have been the third most trusted of all five siblings, he also served as the muscle to Yaotl, who was warrior-king of their brotherhood.
Encased In Stone
While fighting their way to finishing their subjugation of the ancient the country of Paxmec with the siege on its capital Xalica, the five barbarians learned from a wheel-like artifact they seized from within the city's temple about a constellation known as the Stars of Kicaan, which aligned every 3,000 years to send a beam of energy opening a portal to another dimension. As the portal opened, its energy made Yaotl immortal but the price was costly, for it turned Mono and the other three generals to stone and released from its vortex opening 13 monsters that decimated the rest of their army and their Xalican opponents.