Rowan would not be using the entire range of his abilities for this fight and had reduced himself to using Circe and the energy from Ohrox Demon King Abyssal Spark.
This restricted his abilities to a large degree, and even though Rowan would like to deny it, he almost welcomed the challenge. With the tools he had available to him, how could he kill this god who for all intent was an outer universal creature?
The answer was simple, by anticipating all the moves he might be able to make and using the advantages he had created when he led Boreas to believe he was fighting against a Demon King and not Rowan.
If the plans he had set down were going to work perfectly then Boreas had only thirty seconds more to live.