Undead Factions
The God of Death Abaddon manifested in the castle of the Undead King Arthur. He gazed at all the undead kneeling before him that is praying with reverence. He felt all their prayers and worship for him as he cast a magic circle that covered the whole land they were in or rather the whole world they are in.
The whole world came to a standstill as the God Abaddon used his power to influence the land. This is the first step in forming a covenant. It is very difficult to form a covenant if you do not have three things which are land, faith, and a soul.
You need land because a covenant must be performed inside a sacred ground without anyone interrupting. The land must also be pure or has no prior influence of other gods which is one of the reasons that covenants are difficult to do.