世界樹 (World Tree) is a mythical tree found in various cultures, often symbolizing the connection between different realms or worlds. In Norse mythology, it is known as Yggdrasil, a massive ash tree that connects the heavens, earth, and underworld. It serves as a central axis in the universe, supporting various beings and realms. In many video games and fantasy literature, the concept of the 世界樹 is used to represent life, growth, and interconnectedness. It often appears as a powerful entity or location that players must protect or explore, embodying themes of nature and balance in the narrative.