The World Spiral Tree (世界螺旋樹), or simply the World Tree, is an enormous tree consisting of two immense, arching trunks intertwined in a helix-shape, with branches that scrape the sky. It appears in place of Ganishka's twice reincarnated form after Femto uses a stroke from the Sword of Beherits to split open the apostle. At the foot of the tree sits the city of Falconia.
The World Spiral Tree is ground zero of the Great Roar of the Astral World, and is explained by Gedfring to be the source of the global Interstice unifying the Physical World and Astral World worlds as Fantasia. The archmage describes the tree as a massive fissure piercing deep into the physical and astral realms. Prior to its arrival, the World Spiral Tree's growth was being stymied by the spirit trees of the Interstice, which absorbed power from it and hindered the expansion of its branches into the Physical World. With the burning of such spirit trees by Griffith's forces, the World Spiral Tree has grown rampant in a manner reminiscent of the chaos of ancient times.
- Falconians believe the World Spiral Tree to be the source of the surrounding area's ever-fruitful harvest season.
- The branches of the World Spiral Tree can be seen on clear days, and sailors can use them like constellations in broad daylight.