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Originally Posted by John Adams
I've been noticing that it appears the loot drops have been "balanced" regardless of what type it is. For instance, epic pieces that normally are there 100% of the time, have a 7% chance of dropping on a 25 probability loot set. That would need to be fixed to your preference. I'm still trying to wrap my mind around what probability vs chance means. 
They can all be fixed, and I believe it really is to the preference of the Admin. I can't imagine Emu devs dictating how often your loot drops.
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Well... as I understand probability vs chance:
Each mob has 3-4 loot categories (found in Lootdrop)
Nagafen, for example, has 4035_Lord_Nagafen_Wear, 4035_Lord_Nagafen_Trade, 4035_Lord_Nagafen_Misc.
When determining his loot, each of those categories has a probability of being present (found in Loottable_entries)
For Nagafen,
4035_Lord_Nagafen_Wear 100 (multiplier of 2)
4035_Lord_Nagafen_Trade 55 (multiplier of 4)
4035_Lord_Nagafen_Misc 100 (multiplier of 2)
So, based on the multiplier it would check 2 times for 4035_Lord_Nagafen_Wear (and since it's a 100% probability, it guarentees 2 items from that category), 4 times for 4035_Lord_Nagafen_Trade (with a 55% probability of there being an item each time it checks), a 2 time for 4035_Lord_Nagafen_Misc.
Once it determines how many items from each category there are, it determines specific items based on chance (found in Lootdrop_entries)
So, 4035_Lord_Nagafen_Trade has 3 items, Black Sapphire, Ruby Crown, Blue Diamond with a 33%, 33%, and 34% chance of being the item selected.
So to determine the overall chance of an item dropping, you need to multiply the probability by the chance of the item.
Nagafen has a .55 * .33 = .1815 (18.15%) chance of dropping a Black Sapphire.
Hope that helps.