Originally Posted by Thrugg
“The "superchests" are different. Note that they don't all sparkle. This is a bit of a legacy from D2 classic - in D2C the sparkly chests usually meant they were something to do with a quest, like the chest with the eye in it in the Spider Cave. However, non-quest-item sparkly chests (such as the one in Pit level 2) are all superchests, as are all sparkly chests in act 5. But there are many that don't sparkle at all - for example, there is sometimes an old house in the Blood Moor with a chest on the porch which drops lots of stuff (great for a new untwinked char). That is actually a superchest too, even though it doesn't sparkle. Most of the chests in Sewers level 2 are super also.
Superchests go through a more complicated drop sequence. They still drop from the appropriate Chest TC - so you can still predict how high they can drop - but the quality and number of items is handled differently. The superchest will pick a quality, rather like racks or gambles do, with no regard to the player's MF. I believe the numbers are about the same too, ie 1/1000 will be a "unique" drop. The game will then do a drop from the appropriate Chest TC but will try to make every item unique. Bear in mind though that lots of item types don't have unique versions - D2 always chooses type first then quality second - and in that case you will still get non-unique coming out. The chest is also bound by the normal rules of ilvl >= qlvl to drop a unique. Also, the Chest TCs still have no-drop chances, even at p8, and a unique version of nothing is still nothing. It is quite possible many of you have had a unique superchest drop and not realised because no actual uniques came out.
Once it has made its 4 drop attempts, it does do a check to see if it worked. If you don't get a unique the first time it feels sorry for you and tries again - more items, you still get whatever stuff came out in the first drop. If it fails the second time it tries to make up for it by giving you the grand explosion drop - and I'm sure most of you have seen those. It actually loops through the Chest TC over and over again trying to drop magic items like crazy (which usually succeeds, because most item types can be magic).
The same basic procedure applies to set and rare drops too. Sets fail even more often because not many item types have set versions at all. Rares usually succeed the first time though, so when it rolls up "rare" quality you normally get a few rare items and it's done.”
Warrior of Light Posted:
“Sparkling chests have most complicated drops. What is "sparkling" chest? It is chests that have "sparkling" drop mechanics. You may recognize them in the game by quite a loge quantity of items, that they drop. Some sparkling chests are sparkling, like the chest in The Pit Level 2, but some sparkling chests are normal looking.
As Jarulf found, sparkling chests have six options with the fallowing chances:
* 2% chance of option #1
* 4% chance of option #2
* 6% chance of option #3
* 20% chance of option #4
* 30% chance of option #5
* 38% chance of option #6
At option #1 it will do a drop from the respective chest TC trying to generate unique item. However many items, like keys, arrows, gems, runes may only be normal quality. If the game didn't generate at least magic quality item, it will make second drop from the respective chest TC trying to generate unique item. If it didn't generate at least magic item it will go to option #6 process.
At option #2 it will do a drop from the respective chest TC trying to generate set item. If the game didn't generate at least magic quality item, it will make second drop from the respective chest TC trying to generate set item. If it will not generate at least magic item it will go to option #6 process.
At option #3 it will do a drop from the respective chest TC trying to generate rare item. If the game didn't generate at least magic quality item, it will make second drop from the respective chest TC trying to generate rare item. If it will not generate at least magic item it will go to option #6 process.
At option #4 it will do a drop from the respective chest TC trying to generate magic item. It will repeat chest TC drop until 3 magic items will be generated or it will have 10 drop tries.
At option #5 it will do a drop from the respective chest TC trying to generate magic item. It will repeat chest TC drop until 2 magic items will be generated or it will have 10 drop tries.
At option #6 it will do a drop from the respective chest TC trying to generate magic item. It will repeat chest TC drop until 1 magic item will be generated or it will have 10 drop tries. Then it will make up to 4 drops from chest TC with no desired quality, so using normal quality selection algorithm (it means that it uses MF).
That is how sparkling chests generate items. As you see your MF almost not working at all.”