Infernox is a character from Nexo Knights.
Infernox is a gigantic lava monster with a gaping maw who wields a large hammer. He is the strongest of the Lava Monster Army.
Lego Nexo Knights
In Nexo Knights: The Animated Series, Infernox first appears in "The Book of Total Badness" where the Book of Monsters consumes the Book of Destruction in order to summon him and his duplicates.