Parche 4.2

Dungeons & Raids
Bastion of Twilight
The damage modifier on Normal has been reduced for Arion, Elementium Monstrosity, Feludius, Ignacius, and Terrastra.
Removed one of each type of Bound elemental from the Ascendant Council chamber.
Arion
Chain Lightning damage has been reduced.

Cho’gall
Health, melee damage, Health of Corrupting Adherent, Depravity damage, Corrupting Crash damage, Flaming Destruction damage, and Unleashed Shadows damage has all been reduced by 20%.
Corrupting Crash and Depravity
Halved the amount of Corruption they give to 5 from 10.
Corrupted Bite effect caused by Blood of the Old God reduced.
Damage Taken from Corruption of the Old God per Corrupted Blood has been reduced from 3% per stack to 2% per stack.
Debilitating Beam damage has been reduced by 20% to 6,400.
The duration of Twisted Devotion has been reduced by 25%.

Dragon Siblings
Health, melee damage, Twilight Meteorite damage, Devouring Flames, Blackout damage, Unstable Twilight damage, Twilight Zone damage, Twilight Blast damage, Fabulous Flames damage, has all been reduced by 20%.

Elementium Monstrosity
Electrical Instability damage has been reduced.

Feludius
Damage due to being Frozen while Waterlogged has been reduced.

Halfus
Health, melee damage, Fireball/Fireball Barrage damage, Furious Roar damage, Scorching Breath damage, Shadow Nova damage, has all been reduced by 20%.
Nether Scion, Slate Dragon, Storm Rider, Time Warden, and Orphaned Emerald Whelp health has been reduced by 20%.
Shadow Nova base cast time has been increased.

Ignacious
Rising Flames now increases damage by 3% per stack, down from 5%.

Terrastra
Harden Skin now increases Physical damage dealt by 20% (down from 100%.)

Blackwing Descent

Atramedes
Health, melee damage, modulation damage, Roaring Flame Breath damage, and Searing Flame damage has all been reduced by 20%.
Modulation no longer causes Sound in normal difficulty.
Sound given by Sonar Pulse has been reduced to 3 (from 5.)

Chimaeron
Health reduced by 20% and melee damage reduced by 10%.
Chimaeron will now only cast two caustic slimes per 30 second cycle, at second 17 and second 23.

Drakeadon Mongrel
Time Lapse no longer stuns.
Frost Burn silence is now 3 seconds

Dwarven Kings
Whirlwind no longer drops threat.
Execution sentence now deals damage only.
Shield of Light absorption now reduced.

Magmaw
Damage and hit points reduced by 20%.
Lava Parasites have been diminished
Lava Spew damage, Magma Spit damage, Massive Crash damage, and Infectious Vomit damage have all been been reduced.
Mangled Lifeless no longer instantly kills, and damage has been reduced.
Parasitic Infection has been decreased.

Maloriak
Health, damage, Aberation health/damage, Arcane Storm damage, Prime Subject damage, Flash Freeze/Shatter damage, and Scorching Blast damage has all been decreased by 20%.
Aberration stacking damage buff decreased.
Prime Subjects no longer fixate, and are no longer immune to taunt.

Nefarian
Animated Bone Warriors take 33 seconds to fall over, (down from 50.)
Blast Nova cast time increased.
Chromatic Prototype Health reduced 20%.
Electrocute damage reduced 30%.
Fewer Animated Bone warriors spawn.
Magma Stacking debuff effect reduced 75%.
Nefarian health and melee damage reduced by 20%.
Nefarian's Shadowblaze cast frequency cannot increase beyond 1 per 15 sec.
Onyxia health and melee damage reduced by 20%.
Shadowflame Barrage damage reduced 20%.
Tail Lash damage reduced 50%.

Omnotron Council
Barrier absorb amount increased by 100%.
Increased the cooldown on Power Conversion (Converted Power chance).
Health, Melee damage, Electrical Discharge damage, Lightning Conductor damage, Health of Poison Bomb, Incineration Security Measure damage, Arcane Annihilator damage, has all been reduced by 20%.
Flamethrower damage has been reduced by 40%.
Static Shock caused by Unstable Shield damage and Poison Bomb damage has been decreased by 50%.

Throne of the Four Winds

Al’Akir
Acid Rain now stacks every 20s (up from 15s.)
Electrocute now pulses every 1s (up from 0.5s.)
Feedback duration increased to 30s (from 20s.)
Health, damage, and Wind Burst damage have all been reduced 20%.
Lightning and Lightning Rod recast time has been increased.
Lightning Strike friendly chain damage has been halved.
Will no longer use Static Shock on normal difficulty in phase 1 or phase 2.

Conclave of the Four Winds
Gathering Strength cast time has been increased
Ice Patch slow is now 5% per stack, up to 10 stacks (down from 10% per stack, up to 30 stacks), damage reduced by 20%.
Rohash, Anshal, Nezir melee, Ravenous Creeper health/damage, Ravenous Creeper toxic spores damage, Hurricane damage, Sleet Storm damage , Permafrost damage , Slicing Gale, and Wind Blast damage have all been reduced by 20%.
Wind Chill damage decreased by 20%and now increases damage taken by 5% per stack.