The Orb of World Reflection is a Godly Item used by the invaders to conquer the realms.
With it, the chances of a successful invasion are very high.
However, it is a very rare and valuable item that is only used as a last resort and only used to conquer high-level and powerful realms.
Although the Greenheart Realm has a good Time Flow Distortion to it, it is not worth using a Godly Item like the Orb of World Reflection.
It was also the reason why the Undead God Necrothis hesitated a bit before bestowing that Godly Item to the Green Corpse Emperor.
Nevertheless, the Green Corpse Emperor's main purpose was no longer the Greenheart Realm but the human whom he thinks is a favoured apostle to a god.
As long as the Green Corpse Emperor's plan works, he could give a manifold return to his Sponsored God, whereas he himself could not only get the full control of the Greenheart Realm, but his Sponsored God wouldn't forget to heavily reward him.
