NU Link: https://www.novelupdates.com/series/the-false-summoner/ Description As the strongest warrior, the most formidable enchanter, and the most powerful summoner, he is the only one who can summon and get control of the Iron-carapace Beast, so he is the unique Iron-carapace Beast Rider! He is proficient in sword skills and sorcery, like an almighty god. This is the story of Rowen·Wolf, a legendary summoner in the history of Cang Yun Continent.
He summoned a canon perhaps ? or maybe somesort of a transforming robot ? Or is it a coffin, like a vampire's coffing ?