I have a not fun, but a fact from wings of fire.
peril actualy burned a nightwing while protecting clay at the battle of jade mountain.
The book says this. "He heard a roar of pain that sounded like Clay. He tried to fight his way toward Moon or Winter, but they were both lost in the melee of surging scales on the blood-slick stone.
And then one of the Nightwings screamed at a higher register than everyone else and a wall of heat swamped over Qibli. He staggered back, covering his eyes as the screaming black dragon turned into a mass of flames from wings to tail.
'Who's next?' Peril shouted, storming through the fire with her wings spread wide and her tail lashing. 'Who else hurt Clay?'"
from wings of fire, darkness of dragons, page 298 to 299, when the battle of jade mountain begins.