The Ancient God of the Deep Sea was an external deity that the Lady of Pain had mentioned did not belong to the Ring Multiverse.
In the old Multiverse, the Ancient God of the Deep Sea was the ruler of the universe, one of the many rulers.
When the Ancient God of the Deep Sea had attacked the Multiverse where the Lady of Pain was, he had pursued her and arrived at the Great Ring Multiverse.
In the Primordial Era's large ring Multiverse, the Primordial Aragami and the new generation of gods were in full bloom, competing for beauty and not allowing each other to live.
During the first Dawn War, the Ancient God of the Deep Sea had seen through the profound foundation of the Great Ring Multiverse. It was an extremely powerful limited Multiverse, and its size was several times that of an ordinary limited Multiverse.