Damage Modals:
For two handed weapons ...
(2 * weapon damage + Damage Bonus)/Delay
For mainhand weapon 1hander ...
(2 * weapon damage + Damage Bonus)/Delay
For offhand weapon 1hander ...
(2 * weapon damage) * (dual wield percentage)/delay
Add the two.
The formula to calculate your dual wield percentage for warriors is (LVL + DW Skill) / 500
for monks, (LVL + DW Skill) / 400
A warrior and a monk both dual wield jade maces at the same level, same exact gear. The monk will generate more aggro due to higher dual wield skill = more hits.
Let me also mention that the wurmslayer will generate better aggro than a lamentation until lvl 60, to which it actually matches the wurmslayer at a 1.53 rating (because of damage bonus)
AGGRO IS GENERATED WHETHER IT HITS OR MISSES.
It has been PROVEN that weapons over 28 delay also have a slight multiplier bonus for aggro generation due to being slower.
If you are a warrior for the first time on p99 and have no idea what the steel warrior is, do not give tanking advice.
Obsidian shatter is a crap proc and won't help you in the least. The best way to hold aggro is group with people who know how to play.
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With all that said, use wurmslayer/whatever til 37, pick up 2 short sword of ykeshas/ykeshan war clubs at 37, at 50/51 pickup a sarnak warhammer and silken whip of ensnaring. Then you're on the delusional path to epics.
Good luck young warrior.