So I managed to get a Legendary Tribute of Radiance, which I put in the Tribute section of the Brazier - This would give Ancestral Legendaries on Torment 1 or higher, with at least tier 1 attunement. Completed the Undercity, with a friend, on Torment 2 easily within the time limit maxing out Rank 4.
What did I get from the chest? Crafting materials (I already have more than enough… This wasn’t what I wanted from this new event) - Not a single item dropped, so no Legenaries and no Ancestral items of any kind… A total waste of time, for such crap rewards.
He got a single item drop, which was an Ancestral Legendary (thankfully) - So he (barely) benefitted from my run!
If you’re going to put things in the game, please make sure they work beforehand - I’m not wasting my time on the Undercity any more; I’d fare better doing Infernal Hordes for drops, and the time taken.
(This is after giving up doing the intro quests for the Undercity with a friend, as only one person got the quest completion for doing them - And it wasn’t always the person who started the quest. Basically Undercity doesn’t work, and needs to be fixed before I waste any more time going through that for no rewards at all!)