[No explanations are needed because he understands; expert craftsmen and scientists take care of their tools.]

Yes. But the meaning of random is that the result follows no known pattern. I think the arcana are deterministic in some fashion; why brand specific individuals if there is no correlation?

[His mind wanders in thought and centuries of work are imagined in seconds. Determining subjects, experimenting on them and discovering what makes everything tick.]

Imagine if you could change the arcana of a soul. Imagine what could happen if you change your own. It's something to find out, isn't it?

[Don't you want to see what would happen?]