Vault of Incarnates gives NO loot if you run solo or with a group of less than 10 people. I downed 3 bosses we only managed to get some of the ancient vault artifacts.
Legacy loot won’t be enabled for DF until the next expansion, since you need to be at least 11 levels above the content to activate it. This means you could potentially get no loot drops. It’s probably better to run in a larger group for the most recent expansion raids to guarantee loot.