Since "Ylym" relates to knowledge, frame the forest as a or a site of ancient rituals.
While "Ylym" is specifically tied to these collectibles, the term "Dark Forest" itself is widely recognized in two other major areas: Ylym Dark Forest
Unlike the dense, dark coniferous forests we might imagine today, this was a tropical swamp forest. The dominant species were ( Lepidodendron and Sigillaria ). These were bizarre, towering plants that looked nothing like modern trees. They grew straight up like poles, sometimes reaching heights of over 30 meters (100 feet), and were covered in leaf scars that gave them a scaly, reptilian appearance. Since "Ylym" relates to knowledge, frame the forest
Below is an article that bridges these concepts, exploring the "Dark Forest" theory through the lens of a fictional civilization. These were bizarre, towering plants that looked nothing