Shadow of the Necropolis

Floating above the Plaguelands, the necropolis known as Naxxramas serves as the seat of one of the Lich King's most powerful officers, the dreaded lich Kel'Thuzad. Horrors of the past and new terrors yet to be unleashed are gathering inside the necropolis as the Lich King's servants prepare their assault. The Scourge marches again...
Naxxramas is the new 40-man raid dungeon that will present even the most experienced and powerful players with an epic challenge.

General

* The cost to unlearn talents will now decay over time. This cost will be reduced by a rate of 5 gold per month to a minimum of 10 gold.
* After a disconnect from the server, it is now possible to log back in immediately, instead of receiving the message, "A character with that name already exists."
* Chain targeted spells and abilities (e.g. Multi-shot, Cleave, Chain Lightning) will no longer hit stealthed or invisible units unless visible to the caster.
* Fear: The calculations to determine if Fear effects should break due to receiving damage have been changed. The old calculation used the base damage of the ability. The new calculation uses the final amount of damage dealt, after all modifiers. In addition, the chance for a damage over time spell to break Fear is now significantly lower. Note that Fear continues to be roughly three times as likely to break on player targets as on non-player targets. In addition, Intimidating Shout now follows that player versus non-player distinction, while previously it did not.
* Periodic Healing: Spells which do periodic healing will now have their strength determined at the moment they are cast. Changing the amount of bonus healing you have during the duration of the periodic spell will have no impact on how much it heals for.
* Reflection: Effects which cause reflection will no longer reflect triggered effects separately from their base effects (eg. Impact, Improved Shadow Bolt, Aftermath, etc.)
* Optimization code known as "M2Faster" is now enabled by default. M2Faster can improve performance in crowded scenes when "Vertex Animation Shaders" is turned on.

Battlegrounds

* Alterac Valley
o Most of the NPC guard units have been removed.
o Players now drop more quest items.
o Creatures that remain in Alterac Valley have had their hit points reduced.
o The buff that is periodically cast by each faction's Captain has been changed to a flat 20% hit point buff.
o Upgrading troops through armor scrap turn-ins will also now result in your team's General enabling a periodic buff to your melee and spell damage.
o This buff scales from 10% at the Seasoned unit level, 20% at the Veteran unit level, and 30% at the Champion unit level.

Druids

* Innervate: This spell is now a base ability for all Druids, trainable at level 40. Any Druid who formerly had the Innervate talent now has the Swiftmend talent instead.
* Nature's Grace: You will no longer consume this effect when casting a spell which was made instant by Nature's Swiftness.
* Swiftmend: This new talent has been added to the Druid Restoration tree, replacing Innervate as the 31 point ultimate talent. It consumes a Rejuvenation or Regrowth aura to produce an instant heal.
* Enrage: Tooltip edited to clarify functionality.

Hunters

* Counterattack (Survival Talent) - All ranks of this talent will now share the same cooldown.
* Scorpid Poison: Duration slightly lengthened.
* Changed the way hunter pet family armor bonuses and penalties are applied to allow the exact value from the Natural Armor talent to be applied correctly. This may result in a very slight loss of armor to some pets (less than a third of a percent).
* Improved Scorpid Sting: The aura from this Sting will now be removed (as intended) when a different Sting aura is placed on the victim.

Mages

* Due to significant talent changes, mages will have all talent points refunded and can be respent. Training costs for all talent spell replacements have been significantly reduced.
* Arcane Explosion is now instant cast and will no longer remove the Presence of Mind effect when used.
* Evocation - Is now available to all mages (via trainer), starting at level 20.
* Conjure Food now has a new rank (Rank 7) available in Stratholme.
* Frost Ward now has a new rank (Rank 5) available as item loot in dungeons.
* Mana Shield - Damage taken will now be absorbed by other absorb spells (e.g. Ice Barrier, Power Word: Shield) before being absorbed by Mana Shield.
* Dampen Magic - Damage and healing reduction increased on ranks 3 through 5.
* Amplify Magic - Damage and healing bonus increased on ranks 2 through 4.
* Counterspell - Fixed a bug that made Counterspell unresistable.
* Winter's Chill - Changed to increase crit chance by 1% per stack, but stacks up to 10 times.
* Improved Scorch - Duration of Fire Vulnerability increased to 30 seconds.
* Blast Wave: The bonus this spell receives from effects that increase spell damage has been increased.
* Cold Snap: This talent will now always clear the cooldown for Frost Ward, even if the cooldown was triggered by casting Fire Ward.
* Cone of Cold: The bonus this spell receives from effects that increase spell damage has been increased.
* Fire Ward: The amount of damage absorbed by this ward was increased substantially on all ranks.
* Frost Ward: The amount of damage absorbed by this ward was increased substantially on all ranks.
* Arcane Power: This ability will no longer stack with Power Infusion. If you gain both at the same time, Arcane Power will take precedence.
* Added a new level 60 quest available from Archmage Xylem in Azshara for mages.
* Fire Ruby now has a sell value and can be disenchanted.

Paladins

* Benediction: This talent will no longer incorrectly provide a double discount to Seal of Justice.
* Blessing of Light: It is no longer possible for a target to appear to have multiple ranks of Blessing of Light. These multiple auras had no beneficial effect, merely causing confusion. Problems with targeting the spell when the caster has Blessing of Light effect on them have also been fixed.
* Divine Favor: It is no longer possible to cast this immediately after a healing spell and "retroactively" make it a critical hit.
* Illumination: When several critical effect healing spells are cast very quickly, you will now receive the correct mana refund for each one.
* Judgement of Command: Now consumes a charge of the Zandalarian Hero Charm. In addition, when this spell is resisted it will no longer erroneously still do damage.
* Judgement of Righteousness: Now consumes a charge of the Zandalarian Hero Charm.
* Seal of Command: Clarified tooltip.
* Vengeance: Seal of Command critical hits can now trigger this ability.
* Vindication: This effect will no longer be absorbed by Grounding Totem.

Priests

* Lightwell - Casting time reduced. Lightwell object increased in size to make it easier to click; relative click radius decreased slightly.
* Mind Control: If you cast Power Word: Shield while Mind Controlling a target, the Recently Shielded aura will now appear on the correct target instead of yourself.
* Shadowguard: This Troll Priest racial spell now works with Vampiric Embrace, Blackout, and Shadow Weaving. In addition, the damage from Shadowguard will now consume charges of the Zandalarian Hero Charm's Unstable Power aura.
* Spirit of Redemption: This spell has a number of fixes: Priests prematurely leaving battlegrounds with this aura on will now receive the Deserter debuff (as intended); Priests in Spirit of Redemption form at the completion of a battleground will have the aura removed without dying; It will now work correctly with the Darkmoon Card Twisting Nether item, resurrecting you after Spirit of Redemption has run its course; If you should die underwater the Spirit of Redemption will no longer have a breath bar appear; the Warlock Drain Soul spell will terminate producing 1 shard when the Priest switches to Spirit of Redemption form; You will no longer have to wait 30 seconds for graveyard resurrection upon your first death while using Spirit of Redemption.
* Vampiric Embrace: This ability will no longer heal for damage caused when the target had no life remaining.

Rogues

* Detect Traps is now a passive skill.
* Pick Pocket: This ability will no longer trigger effects on your target.
* Slice and Dice: This ability will no longer play its sound effect twice.
* Vanish: Cancelling your Stealth aura while Vanish is running will now cause Vanish to be canceled as well.

Warlocks

* Shadow Ward now has a new rank (Rank 5) available as item loot in dungeons. The amount of damage absorbed by this ward was increased substantially on all ranks.
* Curse of Agony: The damage from this spell will now continue even if the caster dies or leaves the area.
* Emberstorm: This talent will now correctly increase the damage the Warlock takes from Hellfire.
* Hellfire: Aftermath can now be triggered by this spell.
* Improved Shadowbolt: Periodic damage spells and non-damaging spells will no longer consume charges of Shadow Vulnerability.
* Shadowburn: If you cast Drain Soul while this aura is on the victim, you will no longer receive two soul shards upon the victim's death.
* Soul Link: If your pet is banished, it will now break the Soul Link. In addition, Soul Link's tooltip has been clarified to indicate it only works with your imp, voidwalker, succubus, or felhunter.