The Helix Tree (螺旋の樹) is a large, plant-like structure that was formed as the result of Julius Visconti's Singularity powers. In God Eater 2, it came into existance when Julius ceased growing and attempting to devour the world.
Trivia
Post-game in GE2, the Helix Tree can be seen in several backgrounds, such as the Scarred Barricades and the Ice Blue Canyon.