The runic formation that Vlad was engraving on Jamis's chest was not overly complex and went by the name of Demon Cage Runic Formation. The simplicity of the Demon Cage Runic Formation was intentional because if Vlad wanted the Demon Soul Master Strength System to be widespread, the component of this one couldn't be overly complicated.
Of course, the fact that it was simple did not mean it was weak. On the contrary, it was a very effective runic formation, and Vlad spent nearly three hours working on it before it was completed. Once finished, he took out one of the parchments containing a sealed demon soul.
Vlad took a deep breath and rested for a few minutes, ensuring his mind was at its peak before continuing. Very carefully, he activated the power of the runic formation in the parchment, and black tendrils emerged from it, charging into Jamis's Demon Cage Runic Formation, carrying in them a demon's soul.
