An instant strike that deals 110% weapon damage and causes the target to hemorrhage, increasing any Physical damage dealt to the target by up to X. Lasts 10 charges or 15 sec. Awards 1 combo point.
Hemorrhage is a talent in the Subtlety tree that is an instant strike, dealing 110% weapon damage as well as leaving a debuff that increases physical damage dealt to the target.
Ranks 2, 3, & 4 are taught by Fahrad<Grand Master Rogue>, located at Ravenholdt Manor.
[Remorseless Attacks] will give your next Hemorrhage a 20% or 40% increased chance to crit after killing an opponent that yields honor or experience. The improved crit chance lasts for 20 seconds.
[Lethality] increases the critical strike damage bonus of your Hemorrhage by 6%, 12%, 18%, 24%, or 30%.
[Sinister Calling] now increases the percentage damage bonus of Hemorrhage by 2/4/6/8/10%
Item improvement
The 4 piece bonus of the Bonescythe Armor Set gives you 5 Energy for every one of your Hemorrhage critical hits.
The 6 piece bonus of the Bonescythe Armor Set reduces the threat generated from your Hemorrhage by 8%.
The 4 piece bonus of the Slayer's Armor Set increases the damage done by Hemorrhage by 6%.
Damage calculation formula
The basic formula for calculating hemorrhage damage is:
Note that the bonus from Sinister Calling is additive!
Thinking of speccing Hemorrhage?
Hemorrhage does not stack with [Garrote] nor [Rupture] as it is not a bleed effect; the additional damage is not applied to the DPS of either ability.
[Seal Fate] is wasted on a hemorrhage build, as +9% agility and a full +10% attack power is better, until a 30% or higher crit rate is achieved. If you play PvP consider that the average opponent will have around ~400 resilience, so ~10% critical hit chance reduction; you will need around 40% or higher crit rate to efficiently use Seal Fate with hemo. On pre-TBC this options was viable since resilience was not present in the game and was easy to reach 30% crit chance, but even then it was a poor choice in comparison to the standard hemo build as Seal Fate only performed well with daggers with Imp BS and Imp Ambush.
If you plan to use Hemorrhage always look for the weapon that has acceptable DPS with the highest average damage that you can obtain. If you are making a choice, choose the weapon with the best average damage.
For PvE, you do not spec Hemorrhage to top damagemeters, especially not when compared to "normal", i.e. Combat-Sword rogues. Expect your personal DPS on the meters to be lower. You are sacrificing personal DPS to improve overal raid DPS.
Past changes
In Patch 2.3, initial damage was increased to 125% of weapon damage from 100%, but was normalized.
In Patch 2.3.2, 125% of weapon damage was changed to 110% and the damage done per physical strike in the debuff increased from 36 to 42.