What DnD-adjacent pressies would you, or the DnD-obsessed in your life, recommend for a 11-yr old who loves being dungeon master with his friends? He has the starter set plus a dice set and rolling mat, and the DM's handbook. What else is worth it? I've seen some t-shirts on Amazon but they seem to be adult sizes, not kids. The dice towers look cool but I'm think something readable or wearable will be more useful. Any suggestions welcome!