Thread: Let's talk about snatch

I've done plenty of runs using D'art equipped with 2nd lvl Snatch from Gran as an extra ability (Especially for the Advent battles).

What I noticed generally is that while the number of chests increases noticeably on any characters that you killed with Snatch on them, the number of gold (not sure about platinum) chests significantly decreases.

This was most noticed back when I was doing the Apocalypse and Phoenix events where using snatch on mobs as well as the boss allowed me to obtain 2 pages worth of drops, even though the frequency of dropping gold chests noticeably decrease as well.
Anything above the Snatch level of 5 on the enemy started decreasing my gold drop rates all the way down from 0 to 1, while if I don't use Snatch, I would consistently get around 1-2 per run.

This raises the question, how does this "Item drop rate" increase works?
Does it simply increase the drop rate of the bronze and silver chests thus causing the drop rates of gold to significantly decrease?
Or is it something else? If so, is it even worth using Snatch at all in these new buffed up drop rate Advents?

I proposed a study design here. You can spearhead it if you're interested in data collection. At this point, I'd recommend logging gold chests or silver chests rather than a specific drop of interest. However, you might have difficulty finding people who'd sub out a useful ability for Snatch and run Ultimate for you.

How many total Snatch/Snatch-less Ultimate runs would need to be logged in order to be statistically relevant?

Originally Posted by Skulkraken

How many total Snatch/Snatch-less Ultimate runs would need to be logged in order to be statistically relevant?

Assuming a 5% drop rate increase, we'd need about 100 chests of a given rarity in each Snatch group (Snatch, no Snatch). To observe a smaller effect, we'd need more.
Sample size calculator

Ideally, you'd then want to repeat that a few times. That's why I recommended pooling data from multiple users.

...I see.

Wouldn't it be fine to start with just copper chests, then? Ultimate always drops 20+ of them, so it should be feasible even for one player to collect enough of them to do an analysis in just 5 or so runs...or am I misunderstanding what you said?

Originally Posted by Skulkraken

...I see.

Wouldn't it be fine to start with just copper chests, then? Ultimate always drops 20+ of them, so it should be feasible even for one player to collect enough of them to do an analysis in just 5 or so runs...or am I misunderstanding what you said?

Copper chests are a good place to start. But since they drop from trash mobs, that complicates the experiment. You'll have to make sure you land X stacks of Snatch average on each mob (and a minimum of X stacks on the boss). My initial power estimate assumed 5 stacks. We can lower that number, but then you'll have to collect more chests (e.g., 300 for 3 stacks, 700 for 2 stacks). Meanwhile, the control group will do all runs without Snatch. For each group, record the number of chests of each rarity that drop in each run (just record the final tally the game gives you before you hit the next button) until a total of 100 chests of the rarity of interest are collected (more if less than 5 stacks of Snatch per mob). We can then do a t-test on the series of drops per run in each group.

As long as each person uses the same methodology, numbers can be pooled to achieve these targets.