If the Crucible is the primal energy of the Erdtree and where all life once blended together, RPG game Mashup then it has to contain an incredibly large amount of power. This connection also shows the Erdtree's parasitic nature because it needs to feed off of the energy of the Crucible, unable to survive without an external source of energy. Since the Crucible is where life blends together, it can be assumed that the second source of energy for the Erdtree is the souls of the dead who will tell the Tarnished that they are waiting to return to the Erdtree. The reach of the Erdtree's roots allow it to gather those souls easily, and allows it to spread the Greater Will's Grace through the Lands Between .