Eh, I’m assuming I will be that poor soul but even I win 50% chances sometimes. That’s kind of my approach right now: I hoard until I can reach 80% or more. OR, if I amass so many treasures I still have enough to try 50% and leave behind enough to hit 80% on lucky tomorrow, I’ll try the 50%.
Basically those 5 and 10% treasures sit there doing nothing if you don’t use them so I may as well. I think I might auto-spend the 5% ones after looking at the numbers.
Part of the problem is “luck” here works out in your favor very long-term, but you only get 3 shots at “luck” daily.
What we care about is “Did I get chaos shards?” in this discussion. We only get “yes or no” 3 times daily. Let’s ignore “How many do I get?” because that is a different question.
Whether you get chaos shards relies on rolling dice. “Winning a match” is never guaranteed, even at low levels. A bad series of cascades from the level 10 team could destroy you. But that’s going to be really rare. I bet if we played 1,000 level 10 games it’d be so infrequent we’d agree “we can call this 0%”.
So your minimum chest in most reckonings will be between level 2 and 4, based on quality. I don’t know if levels lower than 4 can drop Chaos Shards. If not, then we’re already looking at “You have to have maxed quality to get Chaos Shards every time.” That seems like a good reward for having maxed quality: one of your RNG gates falls down.
Getting a higher chest level requires beating rooms. This is the motivation to even try. Assuming you can beat all of the rooms, the RNG tells you if you get a chest level. The room layout actually determines this probability: I don’t have the map available but I think it’s proven Hall of Guardians has a higher rate overall than All-Seeing Eye? I trust someone else to do the actual probability math but it seems like the average expected chest level gain is between 1 and 2. I haven’t played enough games to get a feel for how close to 2 it is.
So with 0 quality, the “expected” chest level ends between 3 and 4, meaning sometimes you won’t get any Chaos Shards. With 4 quality, it ends between 4 and 5, so you should always get Chaos shards. With maxed quality, it ends between 5 and 6, further guaranteeing shards.
There are very bad luck scenarios where you get +0 instead of the expected +1. These should be rare. With 0 quality, that drops you to a level 2 chest. 4 Quality is level 3. 10 quality is level 4. So if we consider bad luck, we have to max quality to have a shot at Chaos Shards every time.
I will argue the scenarios where you lose before the boss room should be so infrequent they don’t exist. This tilts if you have pushed your Delve level very high, but that also throws all the other probabilities off: the more likely you can lose before the boss room the worse your chances of ever seeing chaos shards will be.
TL;DR:
- At zero quality, you should absolutely try to beat every room or you have no chance of chaos shards.
- At +1 chest level, you need +1 more chest level to ensure chaos shards, and sometimes you won’t win any dice rolls.
- At +2 chest level, you can go straight to the boss room and get some guaranteed chaos shards.
Whether you should do the rooms at +2 quality depends on if the multiplier applies to chaos shards. If so, then whether you should do a room is a complex function of its multiplier and your expected yield.
I don’t know if we have enough data to predict things like “expected yield” yet, unless the drop tables happen to be in the data files.