His plans

The moment he pressed yes, the heart stopped for a short period of time before it started beating again, but this time it was glowing.

What followed next was the golden vessels started moving closer to blood vessels while glowing too.

They didn't have too much trouble reaching them as when they were made they were made parallel to blood vessels, this in return made it so that the length of blood vessels and the mana vessels was equal, which made it easier for the merger to be done without trouble.

When they merged the heart started beating faster than usual due to the volume it needed to push in one vessel being doubled at once but this was only for a short period of time because the runes on the heart started moving and changing their arrangements assimilating with the heart completely.