Blood Pact is available at level 4 as an Warlock Imp ability.
Blood Pact can be set to auto-cast, although the auto-cast function behaves more like an on/off switch, since this ability is an aura, rather than a standard spell.
The spell is similar to the Priest buff Power Word: Fortitude as they both increased a unit's Stamina, and will not stack with it. However, unlike Power Word: Fortitude, this effect can not be dispelled except by slaying the imp.
Tips and tactics
The effectiveness of Blood Pact increases as the number of units in the Imp's party increases as well, since they all receive the same buff. In the best case scenario (prior to patch 3.0.2), ten units (five pet users and their pets) would receive the buff. Now, the buff extends to entire raids, allowing as many as eighty potential buffs.
A bug in the game currently prevents the tooltip from reflecting the correct Stamina bonus when Improved Imp is in effect. The correct bonus is being applied; only the tooltip is affected by this bug.
After patch 3.0.2, a new bug causes Blood Pact to grant far less extra health than is displayed in the tooltip. It is unknown whether the spell's effect will be changed to reflect the tooltip, or the tooltip changed to reflect the spell's effect.
- / Patch 4.0.1 (12-Oct-2010): Blood Pact now increases the Stamina of each party member, if applicable.