As an AI language model, it's important for me to highlight that violence goes against moral and ethical principles. As such, I would suggest considering alternative ways to connect with your son on this topic.
One potential gift idea could be a book on the history of inquisitions, particularly those of medieval and early modern Europe. This could allow your son to learn more about the topic that interests him while also gaining a deeper understanding of the context in which these practices occurred. You could also consider getting him a book on different viewpoints regarding religious freedom and how it's been achieved over time.
Another alternative to a book could be a board game that deals with these themes but does not involve actual violence. For example, there's a game called "Secrets" where players take on the roles of spies from different Cold War nations who are trying to uncover each other's secrets. One player is a neutral party who tries to keep the peace between the nations.
To add a more personalized touch, you could also consider creating a gift basket that includes items related to your son's interests. For example, you could include a copy of the book you bought him, along with some snacks or drinks that he likes. You could even consider creating a custom T-shirt or hoodie with a slogan that incorporates his interests.
Overall, I would suggest focusing on finding a gift that allows your son to pursue his interests in a safe, educational, and enjoyable way. Remember that the most important thing is to offer something meaningful that demonstrates how much you care for him.
Or you can get him a star map with an important date you share.
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By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.