This extra panel artwork of "The Wormworld Saga" features a moment that has occurred during Jonas' and Raya's descend down the Ankal Aasha waterfalls.
The panel was produced for a video tutorial that is published on Yiihuu.cc. The tutorial follows the complete creation process of the panel illustration in real time over 13 hours.
It's available in English here: https://www.yiihuu.cc/c/8285_127_843
With Chinese subtitles: https://www.yiihuu.com/a_9150.html