Seth experimented a little more and guessed that he needed 10 to 20 small souls to change one into

. What did not change was the rating! Even these medium souls were rated as common. This meant he probably could not make uncommon souls from common ones.

He could think about it all day and get nowhere, so he just tested around and soon found a clear answer. He remembered that the vengeful Soul in his bow had been small, so he simply started infusing souls into the bow. He could feel the energy in the bow grow, but only after 13 souls did the description change!