And so Guilliman started the next step of his training,
controlled flow.
Using the Arcane inscription pen, he was able to channel a purple energy from within him to power the pen and draw.
But instead of the full picture, he started by first drawing a line, then another and another. He did this process over and over again; hours later, he burned through his reserves of Arcane energy, so he took a break.
This gave the old man some relief, as unlike before with his seemingly infinite reserves of Soul energy, he now had the opportunity to teach Guilliman how to recover his Arcane energy. Of course, he slipped in something about soul energy there too.
"So basically, I just need to circulate soul energy and it'll replenish my Arcane energy?" Guilliman asked, a smirk appearing on his face.
That was easy!!