"This is the power of the Book of Energy! Simply storing it as a book would be far too disrespectful." Feeling the unprecedented energy coursing through his body, Kaecilius revealed a wild, exhilarated smile.
The Book of Energy's Form Mode had increased the efficiency with which he drew upon and used Dormammu's energy by an unknown number of times. If his previous efficiency had merely been like a straw, taking intermittent sips of energy from the Dark Dimension, then with Form Mode assisting him now, it was like opening a water pipe into the Dark Dimension and releasing a ceaseless torrent.
Normally, such an enormous influx of energy would have made him explode from being unable to bear it. After all, the Dark Dimension's energy was indeed highly dangerous to mages. And as the master of the Dark Dimension, Dormammu would not waste too much effort purifying and filtering his own power so that Kaecilius and the others could borrow it more efficiently. Granting Kaecilius permission to draw upon it was already a concession made because he had surrendered his soul and everything else to him.
Of course, if it had been Ancient One, Dormammu would have been quite willing to put in more effort, and the terms would have been negotiable. After all, such a powerful follower was a prized asset even among Dimensional Demon Gods, someone worth investing every effort into cultivating and discussing benefits with amicably. If Demon Gods were compared to bosses in the human world, and powerhouses within a Single Universe like Odin and Ancient One were compared to employees—had anyone ever seen an employee who could slam the table at their boss, only for the boss to endure it and fawn over them? Ancient One was at that level. To some extent, the future