They truly were.
When leaving the Dark City behind, Sunny had known how powerful the members of the cohort were. However, he had not quite realized just how well-rounded and perfectly suited to face various challenges presented by the Labyrinth their group was.
With Nephis, Effie and Caster leading the charge, most Nightmare Creatures populating the forest of crimson coral had little chance to survive, not with the Crown of Dawn pouring raw power into the armor and weapons of the cohort, at least. Each of the three was a deadly and versatile fighter, with their own unique approach to combat and strengths that complemented each other.
With the three slayers holding off the opponents while being supported by Kai from above, very few things could stand in their way.