Magic Find
Magic find affects the quality of items you acquire from killing enemies (but not treasure chests, vases, weapon racks, or other environmental objects). It doesn’t give you a chance to get more items on a given kill, but instead it increases the chance that an item you find will be magical, and more potent than it would be otherwise.
When a monster drops an item, Diablo III randomly determines the item’s quality from a chart that includes item quality and the number of affixes present. The game randomly "rolls" on each property in the chart to determine which affixes your item will get. Your magic find score is applied as a bonus to these rolls.
For example, if a monster has a 4% chance to drop a 6-affix rare item and you have +50% magic find, it now has a 6% chance to drop that item.
Item quality is checked in the following order:
- Legendary (set or unique both are considered Legendary)
- 6-affix rare
- 5-affix rare
- 4-affix rare
- 2-affix rare
- 1-affix rare
- magic item
Using the above example, when your roll ‘misses’ a higher-level item quality, the item generator proceeds to the next lowest item quality in the chain (in this case, checking to see if you got a 6-affix rare, then checking for a 5-affix rare, and so on). Your magic find bonus applies to each roll. If the same monster has a 10% chance to drop a 5-affix rare item and you have 50% magic find, you now have a 15% chance to get a 5-affix rare item.
Diablo III also differs from it's predecessors in that in involves a "Slot Drop" rather than the normal drop type that can occur in previous games. Previously, as long as a monster's level was high enough to drop the proper item base with appropriate item level and quality level, it would permit the drop to occur, even if the item generated was VASTLY inferior to the level of the monster and difficulty in which it was found.
In Diablo III, the slot drop does not permit the lower level items to be generated, in order to ensure that items you can currently USE on your character will drop rather than useless gear you would have left behind or given away ages ago. An example:
Leoric's Signet is a level 14 ring. To find this ring, you must kill monsters that drop level 14 - 16 rings. They can be found in Act 2 normal, from the Festering Cistern (just before the Oasis) until you reach the Desolate Sands. This item can not be found ANYWHERE ELSE IN THE GAME, and also cannot be found in nightmare, hell, or inferno. To add to the frustration, this ring cannot be found past the Desolate Sands because level 17 rings start dropping in the dungeons there. If you roll a unique ring and it's level 17, you have found a Manald Heal, which is a totally different unique ring.