Not a lot of information on the wikia-seems to have more questions than answers:
Managing Enemy Aggression (Aggro)Edit Managing Enemy Aggression (Aggro) sectionEdit
According to the in-game tips, characters wearing heavier armor draw more hate.
Warriors also have 1 active and 1 sustained talent that generate aggro.
Threaten, the Sustained Talent, only works on the warrior's target
Taunt, the Active Talent, is an AoE taunt.
Is aggro calculated on the absolute value of damage, or is armor penetration considered?
Do heavier weapons (and/or shields) contribute to "threat" (similar to the heavy armor note above)?
If heavy armor generates aggro, is it an absolute value of armor, or is defense considered?
Does crowd control contribute threat to only those affected by it, or by the whole enemy group (because of CC's obvious strategic benefits, maybe everyone gets pissed)?
Does potion "augmentation" (not just health, but balms, poisons, etc.) add threat - more specifically, does using a poison on a tanks weapon help hold aggro?
Certain items can reduce aggro, and are nice to protect a high-damaging mage or archer character:
Amulet of Accord, sold in Lothering
Magister's Cinch
Shadow Belt (Warden's Keep DLC)
Bard's Dancing Shoes, sold at Camp
Other items increase hostility
Cadash Stompers (Stone Prisoner DLC)
Ageless, found in Orzammar's Throne Room
Some weapons???
Note: As of patch 1.02, hostility modifying properties (Increases/Reduces hostility) on items are not implemented properly and do not work.