Bringing Freya into the fight was easy; all it took was letting Luci out and incarnating Freya into her body. But Tarzor was another story. He's a universe, a mass of pure, raw energy that represents creation itself. Both the power of reality and dozens of Essences are fused within him.
It's one thing to incarnate his power into my body—the weight reacts only within me when I fuse—but letting him out is like throwing a colossal mountain into the ocean, even if its size is much smaller. The impact would be like a falling meteor, sending tsunamis rippling outward, devastating entire islands and affecting the surrounding continents. Large-scale devastation wouldn't normally endanger the planet itself.
