Sterl initially believed that with the strength of his soul, no matter how vast the soul of this grotesque worm was, it couldn't entirely resist his Soul Absorption ability. At worst, it might take more time, requiring a gradual, methodical approach to extract its soul memories in their entirety.
But to his surprise, the worm not only possessed an unimaginably colossal soul, but the gray energy core within it granted it extraordinary soul resistance.
The absorption rate was shockingly slow—only about 0.1% per second!
If that were the only issue, it wouldn't have been a significant problem. He could simply persist for ten minutes or more, gradually draining it completely. After all, his soul energy replenished quickly, and he could pause periodically to recover before resuming.