From iRO2 Threat Meter:
All action gain threat by 1 point.
Aggro gets you threat by 1 point.
1 damage = 1 point of threat.
1 heal = 1 point of threat.
DoT shows up on threat. Each DoT shows up as additional threat. (Tested with Head Crush, Oratio, and Wild Crush).
HoT gives 1 threat, does not give threat from follow up heals.
Skill such as Aura Defense, Grizzly Form, Stone Skin multiply threat by 3. So instead of gaining 1 threat per action, per damage, per heal, you gain 3.
Critical does double damage, thus damage = threat, so double the threat. This also include heal.
Some skill gives 1.5 times the threat such as Magnum Break. This is a multiplier that works on Aura Defense, Grizzly Form, and Stone skin.
Finally about taunts such as Intimidate, Beast Roar, and Provoke.
If you are planning to play a tank class.
NEVER USE TAUNT AT THE BEGINNING OF THE FIGHT. THIS IS NOT YOUR NORMAL AGGRO SYSTEM. TAUNT IS USED FOR SPECIFIC SITUATIONS. NOT EVERYTIME WHEN THE COOL DOWN IS DONE!!!
What taunt does in iRO2 is 2 things. First, it brings your threat to the top of the list and 10% more. So if you taunt at the beginning of the battle. Consider you are a Knight with Aura Defense. 10% of 3 = 3. You just wasted your taunt!
Threat is mainly generated by damage and heals (potion included).
Next, the second thing taunt does is that it puts a specific icon on the boss.
THE ICON FORCES BOSS TO ATTACK YOU FOR ITS DURATION AND IF YOU ARE ON THE TOP OF THE THREAT LIST, IT WILL CONTINUE TO ATTACK YOU.
If you are not the top of the threat list, then it will go back to who ever out-threated you.
However, while the icon is on the boss, approximately 2-3 seconds, the boss will attack you, no matter what.
Thus, taunts is used when bosses randomly changes target. Almost every boss does this. The Pnemo in Izlude Cave for example will do this. It is the tank?s job to save taunt and use it when the boss randomly switch target to get the boss to attack them again. Whoever the boss randomly attacks should continue doing what they do. Running around or stop doing anything will not reset this. Boss will attack you for a duration of time before switching back. However, as stated, a tank?s taunt skill will immediately remedy this.
That is all.