Fear induced instant death

The Iris Tyrannus Basileus roared.
A roar loud enough to make the ground clatter.
That was not to assert dominance or an expression of its own emotions.
It was a type of special ability — [Petrifying Bellow].
If one had a similar level to it or had resistances against mental effects, it
would just be an annoying roar. The routing soldiers were about to demonstrate
what would happen if you satisfied neither of said conditions.
Fear twisted their expressions to the extreme as soldiers began to fall.
Fear-induced instant death.

- Volume 14, Chapter 4