The title on the sequence of tweets on sage advice is UA, but I don't see anything on wizards.com: https://www.sageadvice.eu/2018/07/12...zing-skeleton/

I like explosive end--it probably won't create many new blazing skeletons in too many campaigns, but there is some potential for some cultists to mass produce some blazing skeletons. I wonder if this means Orcus is responsible for the balors' death burst?