1. The only main reference of Aristarchus’ work is Archimedes’ book named ‘The Sand Reckoner’.

2. The Castigator is a powerful warjack of the Protectorate based on the same chassis as the Reckoner, which is renowned as the first warjack entirely of Menite design.But in reality the Castigator was actually conceived before the Reckoner, but issues with its weapon system delayed its unveiling

3. "Calamity" is the third book in "The Reckoners" series, following "Steelheart" and "Firefight"

4. "The Reckoners" series postulates an Earth like our own that has been overshadowed by an astronomical phenomenon that people have called "Calamity"

5. Calamity is the concluding novel of The Reckoners series and it was nothing like I expected, but I have yet to decide whether I feel positively or negatively about that