
Originally Posted by
Zadimortis
Based on my experience, here's the conclusions I've come to:
Your amount of light determines the range of probability that you will get a certain tier of chest. If you start with zero light (and no abyssites), your probability for getting the lowest tier chest is at its highest, and as you go up tiers the probability gets lower (say, 80% lowest tier, 10% next tier up, 5% next tier up, 2.5% next, etc.) As your light level increases, your "baseline" chest tier (i.e. the tier that you will get with the greatest probability) goes up. So, let's say that if you have accumulated ten lights, your tier 3 chest (assuming there are five tiers, for blues in this case) probability is 80%, with a small chance of getting higher or lower tiers. At 20 lights, you have the best chance of getting max tier chests, but still have a chance for getting lower tier ones. The lights you build from this point simply push that probability of getting the max tier chests incrementally higher, and eliminate the possibility of getting lower tier chests. It's why EXP groups that build up 20 Azure auras before switching to Pearlescent (no abyssites) do notably worse, because they still have a fair chance of getting chests of lower tier than max, whereas groups that build up 30 or so azures before moving to pearlescent get max tier chests far more often, because they have lowered the chance of getting lower tier chests by a notable amount.
The take-home point of this is that your light strength is not a straight-up bar line that determines what chest strength you get; rather, it determines the range of chest strength you will most likely get, with outliers on both sides (higher and lower tier). As you build up light strength past 30 or so, it simply lowers the chance of lower tier chests dropping, but does not eliminate it (this is why you sometimes see lower tier chests dropping in parties that have been going on for hours with no replacements).
The other purpose of building lights past that point is to determine which chest will drop on the kill. If you build up a significant amount of Ruby light over a long period, eventually it will overtake your amount of Azure light built up, and you will get more red pyxides to drop. Similarly with Azure and Amber. Pearlescent aura determines how frequently chests will drop; the ratio of your ruby/azure/amber lights determines what type of chest will drop. So if you want one type of chest to drop consistently, you should build up that aura strength for a good period of time.
As far as the Abyssites go, I'm fairly certain that each Abyssite gives you ~5-10 aura strength of that color to start with. Pretty damn sure that it doesn't enhance your rate of light buildup, nor does it give you any amount of "luck" with chest opening.
So yeah. That seems to factor in all my observations and outlying occurrences I've either witnessed or heard about, and hopefully it clears up some level of confusion (and bickering).