In the evolution of DnD for more than 30 years, the rules, settings and background are the top priority, and it is often changed to separate and combine, just like the Hydra in myths and legends, growing in the same Physically, they can attack simultaneously and fight separately. One head is cut off here, and two more grow out over there. In response to market changes and investor intentions, DnD has spawned a variety of completely different products. DnD is very successful in some places, such as tabletop games, animation, novels, action games, and RPG games including Golden Box and Infinite Engine.