This is one of the four Warlock's pet Voidwalker's spells, purchasable via grimoires at the various Demon trainers throughout Azeroth.
Suffering is an Area of Effect taunt that allows a Voidwalker to generate threat on multiple enemies. The effect increases with the rank (see chart above).
It is very useful if you happen to get an add or two and want the Voidwalker to hold them off while you run, bandage yourself or try your best to tackle them.
Suffering is on a 2-minute cooldown and, as with 
[Torment], is a Shadow effect that can be resisted.
This ability can be placed on auto-cast; like Torment, it will then be used whenever possible while in combat when there is more than one mob. Because of the long cooldown, putting the spell on auto-cast will usually guarantee that it's not available when you need it the most.
Although intended as AoE threat generation, it can also be cast manually against single targets for aggro-sensitive battles. It generates more threat than [Torment].
| Rank | Level | Mana | Description | Cost | Base Threat |
|---|---|---|---|---|---|
| 1 | 24 | 100 | Generates threat from all enemies within 10 yards. | 30 |
150 |
| 2 | 36 | 165 | Generates threat from all enemies within 10 yards. | 90 |
300 |
| 3 | 48 | 230 | Generates threat from all enemies within 10 yards. | 1 40 |
450 |
| 4 | 60 | 285 | Generates threat from all enemies within 10 yards. | 2 60 |
600 |
| 5 | 63 | 305 | Generates threat from all enemies within 10 yards; reduces their chance to hit by 10% for 15 sec. | 3 20 |
645 |
| 6 | 69 | 355 | Generates threat from all enemies within 10 yards; reduces their chance to hit by 10% for 15 sec. | 6 |
885 |
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