Another Feat.

Surely there has to be one reasonable demon among them that will be the voice of reason. Since no one spoke against the well-thought-out plan to attack the Ominous Reaper, they all attacked.

Every High-rank demon knows a spell or two. They may not specialize in it but since the soul always evolves during each rank-up, their minds have become powerful enough that spells aren't difficult anymore. And spells are the go-to method for quick and ranged retribution against pompous mid-rank demons or any demon of any kind. 

Spells flew from all directions toward Aeternus. They hoped to overwhelm him with the sheer amount of them.

Aeternus tsked, "What's with demons and fire spells? It is as if it's the only spell they know."