Nimona is set in a world that combines medieval and futuristic settings, mixing magic and mad science. Ballister Blackheart is a former knight turned low-grade villain whose evil plots are routinely foiled by his nemesis, Sir Ambrosius Goldenloin of the Institution of Law Enforcement and Heroics. The two men once were friends – or perhaps more – but they fell out and Ballister lost an arm in a fight with Goldenloin and now has a mechanical arm.[2][9] Ballister has been ejected from the Institution because of his missing arm and became a villain.
