Lots of mobs in the HoT zones have a blue bar under their name. This is called a Breakbar, or Defiance Bar. It makes the mob immune to Crowd Control effects.
The usefulness of breaking a breakbar should not be underestimated! For some mobs, breaking their bar can stun them or prevent a devastating attack.
There are two types of Breakbars to look for:
Type 1: It’s always Blue, unless broken (in which case, it will be a brownish color while it regenerates).
Type 2: It turns Blue during a particular phase and you have limited time to break it before it disappears. (This type is typically found on Legendary mobs and breaking the bar will stun the mob and/or prevent a devastating attack.)
Crowd Control (CC) comes in two classifications: Hard CC and Soft CC.
Hard CC includes: Pull, Knockback, Knockdown, Stun, Daze, and Fear
Soft CC includes: Cripple, Chill, Slow, Immobilize, Blind, Weakness, and Taunt
It’s simplest to think of a Breakbar like a Health bar. It has a set amount of Hitpoints and CC reduces those Hitpoints. Hard CC does instant damage to the “Health bar” and Soft CC does damage over time. The longer the duration, the higher the damage. However! Keep in mind that for some mobs, Soft CC only reduces the regeneration of a Breakbar, but does not do damage.
For mobs whose Breakbar is exposed for only seconds at a time, you NEED to have Hard CC on hand.
The following is a quick breakdown by class to show you some of your options (I want to make this comprehensive at some point, but I’m going to skim for now):
Guardian:
Greatsword, the second half of skill 5 is a Pull
Hammer skill 4 is a Knockback
Bane Signet active ability is a 3 second Knockdown
With the Dragonhunter trait Piercing Light, all traps do a 1 second Daze when triggered
Revenant:
Hammer skill 5 is a 2 second AoE Knockdown
Staff, the second half of skill 2 is a 1/2 second AoE Daze
Staff skill 5 is a charging AoE Knockback
Sword off-hand skill 5 is a Pull
Axe off-hand skill 5 is a pull
Shiro Stance Jade Winds is a 3 second Stun
Ventari Stance skill 5 is an AoE Knockback
Warrior:
Hammer burst skill is a 1-2 second Stun, depending on burst level
Hammer 4 skill is a Knockback
Hammer 5 skill is a 2 second Knockdown
Bull’s Charge is a 2 second Knockdown
Kick is a Knockback
Stomp is a Knockback
Engineer:
Rifle 4 skill is a Knockback
Bomb Kit’s Big Ol’ Bomb is a Knockback
Tool Kit skill 5 is a Pull
Flamethrower skill 3 is a Knockback
Hammer skill 5 is a pulsing AoE Stun (can be combo’d with skill 3 on a stationary target to get Dazing Strike, which hits for a few 1 second Dazes)
Ranger:
Greatsword skill 5 is a 1/2 second Daze (or Stun, if you hit from behind)
Longbow skill 4 is a Knockback (if you don’t know this already, you’re probably a Ranger)
Shortbow skill 5 is a 1 second Daze (or Stun, if you hit from behind)
Marksmanship trait Moment of Clarity doubles the duration of your Dazes/Stuns
Thief:
Staff auto is a 2 second Knockdown IF you are stealthed when you use it
Pistol skill 4 is a 1/4 second Daze (basically it’s an interrupt – not that great for breaking bars)
Daredevil, the second half of Fist Flurry is a 2 second Stun
Daredevil Impact Strike is a 2 second Daze, followed by a Knockback
Elementalist:
Staff Air skill 3 is a Knockback
Staff Air skill 5 is an AoE Stun (sort of – they have to enter or exit the field to trigger the effect)
Focus Air skill 5 is a 2 second Knockdown
Focus Water skill 4 is a Knockback
Tornado has a Knockback effect
Mesmer:
Shatter skill Diversion is a 1 second Daze
Greatsword skill 5 is a Knockback
Sword off-hand, the second part of skill 4 is a 1 second Daze
Focus skill 4 is an AoE Pull (if you don’t know this, you’re probably any other class)
Pistol skill 5 is a 2 second Daze/Stun with bounces
Mantra of Distraction is a 1 second AoE Daze
Signet of Domination active ability is a 3 second Stun
Signet of Humility active is a freakin Moa Bird transform (it reduces Defiance bar by some amount on mobs who have one)
Necromancer:
Death Shroud skill 3 is a Fear
Reaper’s Shroud skill 5 is a 1.5 second Stun (on a field duration, so more than 1.5 if the mob stays still… I think.. I’m not a doctor or a lawyer)
Reaper’s Shroud, the second part of skill 3 is an AoE Fear
Greatsword skill 5 is an AoE Pull
Necromancer is incredibly fun to play with a Greatsword. Just sayin’
(edited by Labjax.2465)