"Ghosts are not usually capable of expressing emotions other than boredom or indifference, but there are some exceptions. For example, after repeating the same mundane tasks over and over again, hundreds of times, they can begin to feel frustrated. This results in devastating flames erupting from their tired faces, which is never a good sign, magically speaking."
They will charge up for a moment and fire a flaming projectile at the player's position when the charge began.
Will present as a small flame when the player is not detected, or will be wandering in a very small area until provoked. Their attack is telegraphed by a brief circle of flame and an exclamation point over their head to show the attack is being charged. The flame is temporarily extinguished and stars show over their shoulders when stunned.