Dark Harvest has an amazing description of the Stormcast from a lay person.
"They're not human. They're hollow, but full. Like jugs filled with naphtha. Break one and the world burns" I frowned trying to articulate what I meant. It was hard, even now. "You can smell it on them, pic.twitter.com/L2sVVDLIkr

— A Midsummer Night's Pants (@Pantmonger) April 7, 2023