How Boss Loot Works
#1
Berg, a member of my guild, The Core, posted this interesting piece of information on our guild forum:

Ok so a couple weeks ago I got curious as to how boss drops worked and started looking at some of our drops. I thought I had figured out the probabilities of the nefarion non chest drops but something really bothered me which is that aside from the set armor pieces bosses never drop dupes of the same loot. The common notion was that the system 'rerolled' if it got the same loot but programmatically that is a very stupid way to do things because it could result in an unknown amount of CPU time to perform the transaction. From a programmer perspective you would want this to be single pass operation every time.

So I was trying to think of systems that would result in single pass behavior from the programming side and hooray it looks like i know how boss loot works and it is much different than what everyone thinks hehe.


Nefarion has 4 loot tables A, B, C, D
Loot slot 1 - table A
Loot slot 2 - table A
Loot slot 3 - table B
Loot slot 4 - table C
Loot slot 5 - table D

A = any breastplate. Since A is called twice dupes are possible.
B = Nef head (only item in table 100%)
C =
{
20% chance each
Pure elementium Band
Therazines Link
Boots of Shadow Flame
Neltharions tear

10% chance each
Staff of Shadow Flame
Asscandy
}

Table D is
{
20% chance each
Ring of Reckoning
Prestors
Cloak of Broodlord
Mindflayer hat

10% chance each
Crul axe
Lok amir
}

So nef loot is not entirely random like we think. Many combinations are simply not possible because you only get on item from table C and one from table D. So if Therazines link drops then asscandy cannot drop. This data was all determined from our nef kills this year. I posted this thread on the elitist jerks forums (they are number crunching fools) and it has passed 100% with dkp databases from many guilds. So that got the ball rolling on the following bosses (next thread)
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#2
So boss recap thread. The %'s for the newer material are not yet known. Also it is not clear if C'thuns second loot table only has one rare or if one of those other loots is rare for some reason. This data was from many guilds dkp histories as ours is obviously insufficient alone.

===============
Nefarion
===============
Group A
(20%) Pure elementium band
(20%) Therazines
(20%) Neltharions tear
(20%) Boots of shadow flame
(10%) Staff of shadow flame
(10%) Asscandy

Group B
(20%) Ring of Reck
(20%) Prestors talisman
(20%) Cloak of broodlord
(20%) Mindflayer Hat
(10%) Crul axe
(10%) Lok'amir

===============
Chromaggus
===============
Group A contains
(20%) Taut Dragonhide shoulders
(20%) Chromatic Boots
(20%) Angelista's Grasp
(20%) Empowered Leggings
(10%) Chromatically Tempered Sword
(10%) Elementium Reinforced Bulwark

Group B contains:
(20%) Elementium Threaded Cloak
(20%) Taut Dragonhide Gloves
(20%) Shimmering Geta
(20%) Faction Item
(10%) Claw of Chromaggus
(10%) Ashjre'thul, Crossbow of Smiting


===============
BWL Drakes
===============
Group A
(??%) All gloves
(??%) Taut nexushide belt
(??%) Ring of blackrock
(??%) Rejuvenating gem

Group B
The drake specific loot is here. herald of woe on fgore, drama trinket on ebonroc etc.

So why have we gotten so few rejuv gems?? Cause we have gotten literally like 20 combined rings fo blackrock and nexushide belts LOL.

===============
Skeram
===============
The Prophet Skeram
Group A
(Common) Pendant of the Qiraji Guardian
(Common) Amulet of Foul Warding
(Common) Barrage Shoulders
(Common) Leggings of Immersion
(Common) Cloak of Concentrated Hatred
(Rare) Staff of the Qiraji Prophets

Group B
(Common) Boots of the Redeemed Prophecy/Boots of the Fallen Prophet
(Common) Boots of the Unwavering Will
(Common) Ring of Swarming Thought
(Common) Beetle Scaled Wristguards
(Common) Breastplate of Annihilation
(Rare) Hammer of Ji'zhi

===============
Fankriss
===============
Group A
(Common) Hive Tunneler's Boots
(Common) Libram of Grace/Totem of Life
(Common) Pauldrons of the Unrelenting
(Common) Cloak of Untold Secrets
(Common) Fetish of the Sand Reaver
(Rare) Barb of the Sand Reaver

Group B
(Common) Robes of the Guardian Saint
(Common) Scaled Sand Reaver Leggings
(Common) Barbed Choker
(Common) Silithid Carapace Chestguard
(Common) Mantle of Wicked Revenge
(Rare) Ancient Qiraji Ripper

===============
C'Thun
===============
Group A
(Common) Mark of C'Thun
(Common) Gauntlets of Annihilation
(Common) Grasp of the Old God
(Common) Cloak of Clarity
(Rare) Dark Edge of Insanity
(Rare) Scepter of the False Prophet

Group B
(Common) Eyestalk Waist Cord
(Common) Cloak of the Devoured
(Common) Ring of the Godslayer
(Common) Dark Storm Gauntlets
(Common) Belt of Never-Ending Agony
(Rare) Death's Sting

Group C (Special Extra Drop)
(Common) Vanquished Tentacle of C'Thun

===============
Ragnaros
===============
Group A
Perdition's Blade
Essence of the Pure Flame
Crown of Destruction
Choker of the Firelord
Band of Sulfuras

Group B
Cloak of the Shrouded Mists
Malistar's Defender
Dragon's Blood Cape
Onslaught Girdle
Band of Accuria

Group C (Special Drops) If these drop it is in addition to the normal loots, but not guaranteed to drop at all
Shard of the Flame
Spinal Reaper
Eye of Sulfuras
Bonereaver's Edge


===============
Domo Chest
===============
(Even distribution)
Group A
Gloves of the Hypnotic Flame
Fireproof Cloak
Fireguard Shoulders
Core Hound Tooth
Finkle's Lava Dredger

Group B
Sash of Whispered Secrets
Wristguards of True Flight
Wild Growth Spaulders
Core Forged Greaves
Cauterizing Band

Group C leaf/divinity
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#3
http://forums.elitistjerks.com/viewtopic.php?id=6795

Here's the Elitist Jerks thread for all who are interested. It also backs up the contention that Ouro's supposed to have a B loot table which simply isn't dropping at the moment.
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#4
Hm... going to cross reference this with our last three Nefarian kills to see how well it holds up. Will edit this post to show findings.


Here we go...

Kill 1
Judgement & Bloodfang
Neltharion's Tear (Group A)
Cloak of the Brood Lord (Group B)

Kill 2
Wrath & Transcendence
Askkandi (Group A)
Crul (Group B)

Kill 3
Nemesis & Dragonstalker
Pure Elementium (Group A)
Cloak of the Brood Lord (Group B)


Yep, seems to confirm. Or rather, it doesn't refute the two tables, as we've not had two of the same "group" items drop at once.

*thumbs up*
See you in Town,
-Z
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