"Wherever one goes, one leaves a trace."
This was the statement about the amber worm in "The Evolution Possibilities of Dragons." Due to the translation, Adin Raging Sun's wording was quite complex.
However, after Russell summarized it, he roughly understood what the amber worm was.
"Amber traps some small creatures inside it and then buries them deep in the earth. Those creatures, dead but not stiff, absorb some of the ideas floating between heaven and earth, and thus, with the impetus of the earth's power, they revive as amber worms."
These floating ideas could be the understanding of swordsmanship from a remnant soul, or they could be the vigorous life force of a cluster of thriving thorns.
Or they could be other odd and peculiar thoughts.
Glancing at the M-shaped mark on his palm and the surrounding Sword Butterfly Mark and Thorns Mark, Russell already had a general understanding of the origins of the sword butterfly and the thorn.