Rend

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Rend
Rend Instant Melee range 10 Rage Wounds the target causing them to bleed for X damage plus an additional [1 * ((MWB + mwb) / 2 + AP / 14 * MWS)] (based on weapon damage) over 15 sec. {If used while your target is above 75% health, Rend does 35% more damage.}
Usable by
Class	Warrior
Properties
Type	Offensive
School	Physical
Cooldown	None/Global Cooldown
Talents
Improvement talents	Improved Rend, Blood Frenzy
Other information
Ranks	10
Requirements	Melee Weapon, Battle Stance, Defensive Stance
Related debuff
Rend Bleeding for [X/5] plus a percentage of weapon damage every 3 seconds. {If used while the victim is above 75% health, Rend does 35% more damage.} Duration: 15 seconds

"I gave him a choice: die piece by piece, or all at once." — Gorebelly^{TCGHoA 146}

Rend is a damage over time ability. It is an instant cast, so it doesn't replace a normal attack. It is also one of the few warrior attacks that isn't mitigated by enemy armor.

Even without investing in talents to improve it, Rend is a very rage-efficient attack. Investments in Improved Rend and Blood Frenzy makes it shine even brighter. It's disadvantages are partly that it loses efficiency if the target dies before the Rend has completed it's duration. Also, Rend can not be used in Berserker Stance.

Rank Table

Rank	Damage¹	Duration	Level	Cost
1	15	9 seconds	4	1
2	32	12 seconds	10	6
3	50	15 seconds	20	40
4	70	15 seconds	30	1 20
5	115	15 seconds	40	2 20
6	150	15 seconds	50	4 20
7	185	15 seconds	60	6 20
8	215	15 seconds	68	6 50
9	315	15 seconds	71	26
10	380	15 seconds	76	26

¹Additional damage is added based on weapon damage and other factors. See below.

Additional damage

In addition to the base damage, Rend will deliver extra damage depending on how hard the weapon hits. The formula looks a bit complicated, but it basically calculates the average weapon damage modified for attack power and takes a fraction of this:

                 Weapon Speed x Attack Power                                          743  
Extra damage = ( --------------------------- + Average Weapon Damage ) x Duration x ------
                             14                                                     300000

Note, The DPS of the weapon isn't the most important factor. It's much more important that the weapon is slow.

Example: Wally the Warrior has an attack power of 1400, and he uses a Rend with a duration of 21 seconds. When he uses The Unstoppable Force (Speed 3.8, average damage 233½) his rends will do 32 points additional damage. When he uses Widow's Remorse (Speed 1.6, average damage 100½) his rends will only do 13 points of additional damage, even though Widow's Remorse has a slightly higher DPS-rating than the Unstoppable Force.

Tips and Tactics

This is also a good skill to use in PvP against Rogues, as it makes it more difficult (but not impossible) for them to use Vanish and an additional opener such as Cheap Shot or Ambush.

As with other bleeding effects, elementals and skeletal undead are immune to Rend. (This is now outdated, bleed works on ALL mobs)

Patch changes

Patch 3.0.3 (2008-11-04): Damage has been adjusted to be less base and more weapon based. Ranks 9 and 10 now do 35% more damage when the target is above 75% health instead of 4 times damage when the target is enraged.