We all know the 'unique fountain' phenomenon, and here is why it occurs. Special chests drop like regular chests, but have 95% chance to drop magic items only, 5% chance to drop rare items only. They spawn at the dead ends in the Arcane Sanctuary among other places. Special chests look normal, but have improved drops. (This is responsible for the 'garbage fountain' effect)ДЄ very rare type of chest. If none of the items is at least magic quality, do another chest drop, up to 10 times or until a magic item is dropped. Locked chests go through the drop routine twice, regular chests once. Objects that are not chests will go through the drop routine once, then quit. If the object is anything else, always proceed to the next step.Д¦ items are picked, each following this list:ДЎ6.67%: item Objects: If the object is an urn, rock pile, basket, jar or barrel, 21% chance to proceed to the next step. If the chest is locked, always proceed to the next step. Not all chests and containers will even get to the drop part:Д¬hests: If the chest is not locked, 25% chance to proceed to the next step. I think it will use a higher level auto-TC if the area level is higher, though.Д®ither way, on Destruction difficulty, all monsters (and objects) can drop all base items anyway and there are no differences in drop chance between Act 1 and Act 5 TCs in Destruction, except when it comes to 'junk'.ДЄnyway. Object TCs are grievously hardcoded to the level ID, meaning an uberlevel in Act 1 will drop an Act 1 TC no matter what. Unfortunately, the only missile monsters are quill rats, javelin cats, rogue archers, blowdart fetish, skeleton archers and acid dogs (bug). The bottom line is that it does pay off to hunt monsters with a missile attack if you are looking for bows. Normal missile monsters: regular ranged physical monsters. Normal caster monsters: regular monsters with a spell attack. Normal melee monsters: regular monsters with a melee attack. Stone Maw the Tainted.ДЈ items are picked, each following this list:ДЎx 'Uitem' (~93.55% item, ~6.45% ring, amulet, jewel, gem or rune) Fatal Morgana, Stormbane, Infernal Machine.Дўx 'Uitem' (~93.55% item, ~6.45% ring, amulet, jewel, gem or rune) Superuniques: preset bosses that are the same in every game and are not among the above, eg. Quit after 3 tries or when reaching 6 items total.ДҐ (6 if quest drop) items are picked, each following this list:ДҐ%: ring, amulet, jewel, gem or rune (10% if quest drop)Д«est bosses: Baal, Azmodan, Primus, High Cleric Dorian, High Cleric Gray, Inarius, Tal Rasha, Koth, Juris Khan, Inarius' Ghost, Ennead Necromancer, Malic, Lucion, Avatar of Zakarum.Д¤ (6 if Baal and quest drop) items are picked, each following this list: Terror: 40% chance to drop Runes 10 (up to Lem)Дestruction: 40% chance to drop Runes 15 (up to Ber) Hatred: 40% chance to drop Runes 5 (up to Thul) but capped at Ith due to mlvl, higher runes are discarded

Bosses drop much more and different items than regular monsters.Д¤ items are picked, each following this list:ДЄdditionally, she will try 3 times to drop a rune: The amount and selection of item dropped depends on the monster type. So what do monsters drop, and how much of it? (**) Andariel, Duriel, Mephisto, Diablo, Baal. (*) Blood Raven, Andariel, Duriel, Mephisto, Izual, Hephaesto, Diablo, Nihlathak, Baal, Azmodan, Primus, High Cleric Dorian, High Cleric Gray, Inarius, Tal Rasha, Koth, Juris Khan, Inarius' Ghost, Ennead Necromancer, Malic, Lucion, Avatar of Zakarum. If no set is available for the current item at the current mlvl, drop a double durability magic item.Д¬hampion/regular boss: magic = 1024, rest 0 (guaranteed magic drop) If no unique is available for the current item at the current mlvl, drop a triple durability rare. If it fails all of the above, it is low quality. It first goes through these steps for unique items, then rares, then sets (yes, not the other way round), then magic items, then superior items, then normal items. Rare: if MF > 10 then EMF = MF*250/(MF+600) else EMF = MF Set: if MF > 10 then EMF = MF*250/(MF+500) else EMF = MF Multiplication for extra precision: chance = chance*128Д®MF is counted in: chance = chance*100/(100+EMF)Д¬omparison to itemtypes Min: if (chance 10 then EMF = MF*250/(MF+250) else EMF = MF The quality of item drops is based on several factors: the stats in itemratio.txt, the treasure class (bosses drop better than regular monsters), and the item level compared to monster level.Д«ase chance: chance = itemratio - ( mlvl- ilvl)/div

Diablo 2 drop rate mod