We go in and tell you what the blues have said about the new classes all in one easy to browse location..

New Death Knight Abilities

Outbreak (level 81): Outbreak infects the target with both Frost Fever and Blood Plague at no rune cost. This ability allows death knights to apply diseases quickly when they are switching targets or when their diseases have been dispelled.

Necrotic Strike (level 83): Necrotic Strike is a new attack that deals weapon damage and applies a debuff that absorbs an amount of healing based on the damage done. For context, imagine that the death knight can choose between doing 8,000 damage outright with a certain ability, or dealing 6,000 damage and absorbing 4,000 points in incoming heals with Necrotic Strike -- the burst is smaller, but a larger overall amount of healing would be required to bring the target back to full health.

This ability is meant to bring back some of the old flavor from when death knights could dispel heal-over-time (HoT) effects. It also gives the class a bit more PvP utility without simply replicating a Mortal Strike-style effect.

Dark Simulacrum (level 85): The death knight strikes a target, applying a debuff that allows the death knight to copy the opponent's next spell cast and unleash it. Unlike Spell Reflection, Dark Simulacrum does not cancel the incoming spell. In general, if you can't reflect an ability, you won't be able to copy it either.

Rune System Changes

While we're satisfied with the way the rune system works overall, we're making a few major changes to the mechanics that will ultimately help death knight players feel less constrained. Here's the rationale behind the changes, followed by an explanation of how the new system will work.

• In the current rune system, any time a rune is sitting idle, death knights are losing out on potential damage output. By comparison, rogues spend most of their time at low energy levels, and if they're unable to use their skills for a few seconds, that energy builds up and can be spent later, minimizing the net loss from the interruption.
• A death knight's runes, on the other hand, cannot be used until they are fully active. If a death knight ever goes more than a few seconds without spending an available rune, that resource is essentially wasted. Because the death knight is pushing buttons constantly, it can be difficult to add new mechanics to the class because the player doesn't have any free global cooldowns to use them. We can't grant extra resources or reduced cost, because there is no time to spend them. Missing an attack is devastating, and it's impossible to save resources for when they're most useful.
• Additionally, each individual death knight ability has a fairly low impact on its own, making it feel like most of the death knight's attacks are weak. The death knight's rotations are also more easily affected by latency or a player's timing being just a little off. At times, it feels like death knights aren't able to take advantage of their unique resource mechanic, which can diminish the fun.
• The new rune system will change how runes regenerate, from filling simultaneously to filling sequentially. For example, if you use two Blood runes, then the first rune will fill up before the second one starts to fill up. Essentially, you have three sets of runes filling every 10 seconds instead of six individual runes filling every 10 seconds. (Haste will cause runes to fill faster.) Another way to think of this is having three runes that go up to 200% each (allowing extra "storage"), rather than six runes that go up to 100% each.
• As this is a major change to the death knight's mechanics, it will of course require us to retune many of the class's current abilities. For example, each ability needs to hit harder or otherwise be more meaningful since the death knight is getting fewer resources per unit of time. Some abilities will need to have their costs reduced as a result.

Talent Changes

Next we'll outline some of the death knight talent-tree changes we're planning in Cataclysm. This list is by no means comprehensive, but it should give you a sense of how we're intending each death knight spec to perform.

• One of the biggest changes we're making is converting Blood into a dedicated tanking tree. While we feel that having three tanking trees was successful overall, it's less necessary in a world with dual-specialization. In addition, the current breakdown isn't as compatible with the Mastery-based passive talent-tree bonuses we want to add (see below). We'd rather spend time tweaking and balancing one good tanking tree rather than having a tank always wondering if they picked the "correct" tree out of three possibilities.
• Blood seemed like the best fit for tanking. Unholy has always had a strong niche with diseases, magic, and command over pets. Frost now feels like a solid dual-wield tree with Frost magic damage and decent crowd control. Blood's niche was self-healing -- fitting for a tank -- as well as strong weapon swings, which could easily be migrated to Frost and Unholy.
• Our plan is to move the most interesting and fun tanking talents and abilities to Blood. For example, you will likely see Vampiric Blood and Will of the Necropolis remain, while Bone Shield will move over from Unholy.

Mastery Passive Talent Tree Bonuses

Blood

• Damage reduction
• Vengeance
• Healing Absorption

Vengeance: This new mechanic is designed to ensure that tank damage output (and therefore threat) doesn't fall behind as damage-dealing classes improve their gear during the course of the expansion. All tanking specs will have Vengeance as their second talent tree passive bonus. Whenever a tank gets hit, Vengeance will grant a stacking Attack Power buff equal to 5% of the damage done, up to a maximum of 10% of the character's unbuffed health. For boss encounters, we expect that tanks will always have an Attack Power bonus equal to 10% of their health. The 5% and 10% bonuses assume 51 talent points have been put into the Blood tree; these values will be smaller at lower levels.

You only get the Vengeance bonus if you have spent the most talent points in the Blood tree, so you won't see Frost or Unholy death knights running around with it. Vengeance will let us continue to design tank gear more or less the way we do today; there will be some damage-dealing stats, but mostly survival-oriented stats. Druids typically have more damage-dealing stats even on their tanking gear, so their Vengeance benefit may be smaller, but the goal is that all four tanks will do about the same damage when tanking.

Healing Absorption: When you heal yourself, you'll receive an additional effect that absorbs incoming damage.

Frost

• Melee damage
• Melee Haste
• Runic Power Generation

Runic Power Generation: This will function as the name implies, and the new rune system will make generating Runic Power more appealing.

Unholy

• Melee damage
• Melee and spell critical damage
• Disease Damage

Disease Damage: Unholy death knights will be able to get more out of their diseases, which are integral to the tree's play style.

Explaining the new Rune Mechanic (from Ghostcrawler)

I'll take a stab at explaining the rune mechanic. Once you see it in action, it's pretty easy to understand.

Just focus on Blood Runes for the moment. The big change is that rune #2 will never start filling up until rune #1 is full. They always fill 1 then 2. Today 1 and 2 can both fill at the same time.

In Cataclysm, when you're killing things, you use rune 1. Then any extra "red" in rune 2 will fill rune 1 back up again. If both of them are full, you can use 2 Blood Runes immediately. But after that, rune 1 will fill up first and then rune 2. If it helps, imagine rune 2 is the extra tank.

This sounds like it will slow down DK attacks, and it will to a point. That's part of what we're trying to accomplish. We can then fill those extra GCDs with things like free abilities or runic power abilities or we have room to add talents that make runes fill faster. Remember, slow attacks can hit harder though. Instead of DKs hitting fast like a rogue, they'll hit slower and harder, like a warrior, which fits a lot of player's image of a DK anyway. Dual wield will hit faster of course.

I'll try another comparison. Imagine that all rogue abilities cost 100 energy. They have to wait until they get 100 energy, and then immediately use an attack so that they aren't wasting future energy. That's how DKs play now, except they have 6 runes to watch. Now imagine the same rogue except all his abilities cost 50 energy. If he hits an attack when he has 60 energy, then 50 is consumed but he has 10 energy still left and a head start on the next attack. That's the way we want DKs to play.

If that still doesn't make sense, then focus on what the experience will be, which is that you'll have more breathing room in your rotation and won't have to hit a button every single GCD. If you don't use a strike the second it's available, that's more okay because the extra tank will store extra rune resources rather than just wasting it. You'll still be hitting a lot of buttons though. We're keeping double rune strikes and Death Runes and disease multipliers and all of that. We'll have to make some changes in some abilities to accommodate the resource change, but it won't be unrecognizable to you.

We're not sure DKs even need Rune Strike any longer. If it survives, we'll turn it into an instant swing. But if we turn it into an instant swing, then it really isn't that different from existing strikes so it's possible we can just make a tanking rotation without it.

Blood is the New Tanking Tree (from Ghostcrawler)

In Cataclysm, death knights will have a dedicated tanking tree, much like the other three tank classes. That tree will be Blood.

We’ll go into more detail in the upcoming preview, but we wanted to take the opportunity to explain the reasoning for such a big change.

Why the about face? We actually thought the “tri tank” experiment worked out okay. We suspected there would always be a “best” tanking tree, because that’s the way these things shake out, but we hoped it would be close enough that many players could tank with their favorite tree. When we tried out this design for Wrath of the Lich King, we were using it as a test case to see if we wanted to do similar things with the warrior and paladin talent trees.

A lot has happened since that time. We introduced the dual-spec feature, allowing players to have a tanking spec and dps spec that they could switch between. We introduced Dungeon Finder, which makes it easier to find players who want to tank, and even let players level up using a dedicated tank spec. In Cataclysm, we are introducing the concept of passive talent tree bonuses and we think that feature is a lot stronger when the talent tree has a particular focus (such as damage, tanking or healing). For example, it’s safer to give more passive damage to a tanking tree than we can a dps tree. Above all, we were just spending a lot of effort trying to balance three trees (though it was really six trees, since each tree was trying to do two things).

It started to feel unfair to the other tank classes that we had to spend so much effort tweaking three types of DK tanks, and it even started to feel unfair to the DK that we couldn’t focus their tanking experience. One bit of feedback that really struck home was the DK players who said, essentially, “I look at the Protection tree and I’m jealous of all of the cool tools they have to help their tanking. As a DK, I have to pick and choose tanking talents from within a sea of dps talents.” Rather than have a strong focus, the trees felt a little watered down because they were trying to do so much. With Frost as a dual-wield, spell and runic power focused tree, Unholy as a disease and minion focused tree, and Blood as a self-healing, defensive cooldown, tanking tree, we think the focus of each tree is a lot clearer and cooler.

In Cataclysm, Blood will be the death knight version of a Protection tree. It will have passive talent tree bonuses that reflect tanking. It will have tools, such as a Demo Shout equivalent, necessary for tanking. Several of the more fun tanking talents from Frost and Unholy will be moved into Blood. We will be able to revise (or even remove) clunky mechanics like Rune Strike and focus on letting DKs generate threat with their normal Blood tanking rotation.

This is major change, and we understand it will be met with some disappointment from players who really liked the flexibility, those who appreciated the unorthodox talent tree design, or those few of you who really liked Blood dps. Nevertheless, we are convinced that this is the right change for the game.

Next: Druid