A surprise Mythic+ affix has appeared on the PTR, Shielding periodically summons Orbs that shield nearby enemies if not destroyed!
Interestingly, this affix was hinted at previously in Blizzard’s Mythic+ Affix Feedback post last week as a potential change to Explosive, although today’s Mythic+ Affixes Update left it out entirely – opting to replace Explosive with Volcanic instead.