I came to the conclusion that with Leander having half of lowtown willing to kill for him, Ais basically playing bowling with the guys attacking him, Vere eating Souless for breakfast ect, my Mc also had the right to be unfairly powerful, curse apart.
And since ive chosen to make them a Monster as well, I want them to be pretty scary at times.
One if Onyx's biggest flaw is that their patience and leniency can cause people to get too comfortable. It's extremely difficult to anger them, so no one expects how cold and even cruel they can become once the boundaries they DIDN'T voice have been crossed.
They don't feel any pleasure in harming others, it's simply that they don't have the same ethics humans do. Once a line has been crossed, you're pretty much done for.
They have a special spell for when their peace gets disturbed...
Vere wrote down the incantation and tried the spell himself, but he couldn't manage to make anything happen. So it's probably safe to read out loud, if you so desire.
When asked, Onyx said it was just a poem, called ''Forced last breath''
For the birds of finality
Are dropping from the skies
Than the embrace of death
of the peace you broke yourself
Lightened from the burden
that was never mine to carry
May you rest in the peace
of a chance you forever missed
Basically it instantly kills someone. No pain, just like snuffing out a candle :)
So yes, Onyx is extremely sweet, and would help anyone if asked. But their gentleness is a choice, considering how destructive they can be.