The White Monks in the group attacked Inti with relentless series of repeated onslaught of their martial arts skills powered by Ki.
Their actions were quickly backed up by their long-range attackers, and they left no chance for Inti to escape their barraged of spells, arrows, and exploding duds just to lower the High God's HP.
Great Dynasty did manage to lower Inti's HP by 20% before the High God used one of its Legendary Actions.
Unlike with most high ranking beasts that entered [Berserk Mode] and [Last Stance Mode], High Gods and other Gods didn't have that kind of instinctual advantage. What they had were lists of Legendary Actions that they could freely cast one battle at a time.
A good thing about this was that, they couldn't cast the same Legendary Action simultaneously and that this list of Legendary Actions could only be used once per battle.