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Threat is tanking. The number one thing a tank has to know is what threat is and how to control it. If you don’t know you can’t tank. Period. If you are interested in tanking you need to gain a working understanding of what threat is before you start.
If you have played WoW at all you are going to think this is somewhat obvious and simple. But stick with me for a little while. There are some tiny nuances that are of MAJOR importance to a tank. All those things that happen in the game happen for a reason. Learning the underlying mechanics of them will make you a good tank.
Threat is an invisible feature that every creature has. If it helps you can think of it as a reverse health bar. Every critter just hanging out in the world has zero threat on it.

The instant that creature spots something it wants to kill it gains one point of threat towards that person.

The murloc has spotted the gnome. Now it has just one point of threat toward her and none toward anyone else.

This one point is enough to give the murloc an intense burning desire to drop everything it was doing (hanging out gurgling) and go stab the gnome to death (our horde readers can identify with this urge).

So now the murloc does this; stabbing the gnome for a few points of damage. Notice the threat level the murloc has does not change. When a creature does damage to something he does not generate any more threat toward that creature. All of his threat bars stay the same. The gnomette still has just one point of threat and the rest of the world has zero. Notice that the threat meter is associated with the Murloc. It is ‘his’ threat. Each creature in the game has their own little threat list. They hold a grudge on everyone who is on that list and will try to kill them.
Now let us say that the Gnome defends herself.

Notice that the meter went up. Now the Gnome has 11 threat. Because she is the only one here it does not matter how much she has. She is still the at the ‘top of the threat list’. This means that she ‘has aggro’. Also note that the ‘threat’ the gnome generated by attacking the murloc is proportional to the amount of damage she did to it. If she takes a few more swings that number will keep going up to keep pace with the amount of damage she does.
Now let’s see what happens when things go badly.

The gnome has died (/cry). But notice the threat meter. The Gnome is no longer on it. The list of threat for this creature is reset because the only one that was on its list is dead. It will run back to its home. Other things besides dying can reset the meter. For example a hunter using ‘Feign Death’ will do the same thing. The hunter will drop completely off the threat list and the creature snaps back to its home.
Simple right? Don’t go away yet. It gets more complicated.
First of all I will start drawing the threat list to look like an addon called Omen. There are other addons out there (and a built in feature) that let you actually see the threat a targeted creature has. For a tank these addons are very helpful. They are particularly helpful early in your tanking when you are trying to gain complete mastery of this ‘threat’ stuff.
This example has a lot more going on….
Here is a happy piggy… er, vicious razorback boar in need of killing.

And here is a band of friends out questing. There is a gnome rogue, a druid healer and a draenai paladin.

The boar sees them, but since it is a happy boar (yellow name) it does not get any threat toward them. It has aggro on no one and its threat list is empty.

What’s this? The rogue was stealthed and just backstabbed the poor pi… er. I mean vicious mean boar. Now we can see the threat table below. It is turned sideways to make it easier to see who is on the ‘top’. Also that makes it look more like an Omen meter. As we can see the only one on the list is that mean little backstabbing… I mean our friend the rogue. No one else has done anything to the boar so no one else is on the list. What else do you notice? The threat on the meter is less than the damage the rogue did. This is because the rogue took talents points into something that lowers his threat.
(Actually rogue talent trees don’t have any skills like that but some classes do.) For example a warrior in berserker stance would generate less ‘threat’ than the strict amount of damage he did to the target. By being in the correct stance he can keep his threat low. We will get into more on this later. The numbers I am using in this tutorial are only a rough estimate and not strictly accurate examples.
So what happens next?
Let’s say our paladin is trying to be a tank. So she is going to use a ‘taunt’. In this case the actual ability is ‘hand of reckoning’ but the important thing is that it is a ‘taunt’ type ability.

A taunt is what we call a broad class of abilities that all share a certain feature. There are minor differences between them but the main feature is that you, the tank, are given as much threat as the highest person on that target’s list, plus one. This is great because it puts you on the top of the threat list. A taunt will ALSO force the target to attack you. This has the effect that after you use the taunt you have 1 point higher threat than anyone else and the target is planning to attack you.
Notice that I broke that into two pieces, first getting to the top of the threat list, and second that it will attack you. This is because, in WOW, even if you are at the top of the threat list, you actually have to do 10% more threat than the current ‘leader’ on the list in order to get the creature to attack you. Let’s say the paladin had only swung her mace at the target and not taunted it. She would have generated as much aggro as the damage she did. In order to beat that 10% buffer she would have had to hit the target for 17 points of damage for it to ignore the rogue and attack her instead. By taunting instead she does not have to rely on doing enough damage to get to the top of the list. The taunt blasts her to the top of the list AND makes her the target instantly.
So now she has taunted off the rogue and is at the top of the list. What next?

The paladin, confident that she is now ‘tanking’, merrily swings at the boar and does 10 points of damage. At the same time, the rogue attacks again and does another 15 points of damage. Now the rogue is back at the top of the list! And, even more than that, the rogue is more than 10% higher than the paladin. So now the boar is going to attack the rogue.

Here we have the boar om-nom-noming on the rogue. The paladin is desperately whacking it with her mace and the rogue is in a panic, stabbing harder than ever. They are both doing damage, but the paladin is just not catching up.
This could go on forever. When the pally’s taunt is off cooldown she could use that again, but she would have to get lucky to keep the boar off the rogue for long because the rogue is doing more damage than her. This is the makings of a frustrated tank who is confused as to why she can’t ‘hold aggro’.

But it does not go on forever. The rogue is going to cast Feint. This ability lowers a rogues threat by a set amount. Because I am using fake numbers I am just going to say it is 30. The real number is a lot more but all these numbers are just place holders for the real values to give you the idea of how it all works.

So in this next moment the rogue stabs again and uses feint, and the pally hits again with her hammer. The rogue gains some threat and loses a some from feint and the pally just gains. Now the pally has a very good lead and can hold aggro.

On a side note this tank may not realize the target is now attacking her due to something the DPS player did. She might think she has succeeded as a tank but in reality the other player has saved her bacon. So everything is good again…

Except now the healer wakes up.

The healer throws a nice big aoe heal. So what does that do? Now the healer is on the threat list. For every point of healing that is done to each person on a creatures threat list the person doing the healing gains that much threat. This means a creature can easily get far more mad at the person healing the guys hitting it. This goes for other kinds of buff spells too, even ones that are not healing. Almost anything you do to help someone who is fighting causes whatever they are fighting against to get mad at you.

So now the healer has blown past the other two on the aggro table and pulled the boar off of them. The druid ‘pulled aggro’ big time. He did that by doing more threat and getting to the top of the meter. He even got over the 10% ‘buffer’. But, actually is is more than just 10%. The 10% buffer is for melee targets. For caster-range targets it is 30%. What this means is that if the tank has 100 points of threat it will take 110 points of threat coming from anyone in melee range of the critter to pull it off the tank. For any party members outside of melee range it will take 130 points of threat to ‘pull aggro’.

Aggro boosting

Innate boosting

So what is this tank doing wrong? One of the things wrong is Righteous Fury. The ability that separates a damage dealing Paladin from a tanking Paladin is Righteous Fury. This ability makes all of their holy damage attacks do 80% more threat. So if the paladin throws an ability that does 100 damage points to the target the threat will be 180 instead of just 100.
This concept is very important. Every tanking class has some mechanism or ability that allows them to do more threat from their attacks than just what the damage would cause. This is important because in many situations other members of the party will actually be doing more damage than you. They put all their talent points into things that make them hit harder while you were putting points into things that make you block, dodge or parry better. It is almost certain that in an given party someone will be doing more damage than you. This gets even worse at higher levels. In an endgame raid for example some people will be doing well over double the damage you, the tank, are doing. Taunts are great for getting things to attack you, and for bumping your threat to the top, but if you do not have a way to pump your straight threat output up higher even taunts will not keep critters attacking you for long.
Each class of tank has a different way of pumping out more threat than damage. For Druids it is a feature of bear form. All damage caused in that form does more threat than it normally would. For warriors the defensive stance has this feature built into it. For DKs it is Frost presence (not to be confused with frost spec, DK can tank in other specs).

Specific boosting

In addition to abilities that raise the threat generation of all their attacks tanks also have attacks that specifically generate extra threat. These abilities have various amounts of extra threat they apply to the target over and above the damage they do. Some of them do very little damage but still apply a good bit of threat. Abilities like this will specifically say they do extra threat in their tool tips. What those moves are depend on what class of tank you are playing. A good tank will work these types of moves into their rotation.
It is important to understand that as a tank it is more important for you to be doing threat to the targets than it is for you to be doing damage. The DPSers are there to actually kill the creatures. You, the tank, are only there to keep the creature distracted from killing the DPSers or the healer. If a tank also does good damage that is just icing on the cake. Sometimes tweaking your rotation to do more damage will also increase the threat you cause, but not always. Sometimes it will lower your threat. As a tank it is your job to do the research about your class and spec so that you know what things increase your threat and what things do not.

Aggro Reduction

As I already mentioned, some dps classes have features that do the opposite, abilities that lower the amount of threat caused by attacks. Some are innate, meaning they lower all the threat caused by attacks. For example in cat form a druid doing 100 damage with an attack will do much less than 100 points of threat.
Aggro dumping
The final class of aggro abilities are ones call ‘dumps’. In the example above the Rogue used Feint which is an ‘aggro dump’. This means it drops your overall threat . There are a lot of different aggro dumps in the game. They work in a wide variety of different ways. Priests have Fade when just lowers threat by big chunk. Hunters have Feign Death which completely removes all of their threat and drops them out of combat entirely. Some aggro dumps are temporary. For example if a night elf shadow melds that will only keep creatures off them until they come out of it. If the combat has not ended when they get out of shadow meld, either by taking damage or by doing something, then all the threat they had before comes roaring back.

Forced attacks

The last things to talk about on this subject is very important. Forced attacks are a class of abilities that tanks have that are extremely useful. They also have some important drawbacks so it is vital to understand them.
A forced attack is an ability that forces a targeted creature to attack you. This is NOT the same things as a taunt. The critical difference is that a forced attack does not increase your threat and put you on the top of the list for that creature to attack. Instead these moves just artificially put you to the top of the list temporarily. As soon as the ability wears off those creatures will go back to attacking whoever is REALLY on the top of the list. These moves are very useful for buying you time. A good example is Challenging Shout. This ability forces a bunch of enemies in the nearby area to attack the warrior using it for a few seconds. It hits a lot more targets than a ‘taunt’ move so it is very good for getting large numbers of creatures to stop attacking someone. For example if a patrol just attacked your party and they all start beating on the healer this move will instantly get them off the healer. BUT only for a few seconds. So it is critically important that the tank use follow up moves to generate threat on those critters before the forced attack wears off. If the tank does this then the day is saved. If not all of those creatures will go back to chewing on the healer and there is a good chance the party is doomed.

That does it for the intro to threat and the explanation of the categories of abilities. As a tank it is very critical to know the mechanics of what your abilities do. When and how to use those moves is a subject for more posts.
Whenever you are not sure do some reading! There is a lot of good information out there and there are a lot of tricks and hidden things to learn about how it all works. For example I recently had to do some research into ‘taunt immunity’ after a failed ICC raid. What I discovered was that the other tank had doomed us by over-using his taunts on the 4th boss and making him immune during critical tank swaps. If you are a new tank and don’t know what I am talking about don’t worry about it. The important thing is never assume you have it all figured out. Just when you have learned most of it Blizzard will change something.

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