The Yggdrasil Tree is a recurring plot element of great relevance and significance that appears on every game of the series, which is not strange since the original name of the games contains Sekaiju (World Tree), which is usually translated as Yggdrasil. No matter the game, it is depicted as a huge tree that is somehow linked to the Yggdrasil Labyrinth. However, its role changes from game to game. Spoiler Warning: Plot details follow. Read at your own risk.