Manga Maseki Gurume: Mamono No Chikara O Tabeta Ore Wa Saikyou!

Only me has the potential to gain incredible strength in this world. For this I need to eat magic stones! It all started with my acquaintance with the next reincarnation of the goddess, who decided to give me a special ability that allows me to fight any toxins. At first, this ability seemed useless to me, even my close ones and relatives laughed at me. But as it turned out, this incredible skill allowed me to absorb the power of the magic stones, which significantly increased my power! It also turned out that I am the crown prince of a neighboring kingdom. I now have a castle where I can regularly experiment with magic stones and also practice sword fighting to become the strongest man in the world. Now you can read the story of the poor boy who managed to become the strongest king, as well as the obstacles that stood in his way!