Consume Shadows

Consume Shadows is a channeled heal over time and mana regeneration spell that the Voidwalker casts on itself. It is automatically learned by the Voidwalker at level 56.

Considering how quickly pets regenerate health anyway, it's not often useful, although being Soul Linked to a Passive Voidwalker that is Consuming Shadows is one amazing scenario. However, if your Voidwalker has taken a particularly rough beating after a battle (which will be the case more often than not), this ability can help reduce downtime tremendously.

The ability's stealth detection buff can also be useful in a number of PvP scenarios. For instance, defenders in battlegrounds (especially Warsong Gulch and Twin Peaks) can continually channel this ability in order to prevent rogues and druids from launching surprise attacks. It can also be an effective counter when a nearby enemy rogue or druid is seen slipping into stealth.