The Demon Guardian has a duration of 15 seconds. Each successful proc of Bane of Doom will summon a fresh Demon.
Unlike most DoTs, Bane of Doom is not affected by haste.
[Doom and Gloom] (Affliction, Tier 1): Increases the critical strike chance of your Bane of Agony and Bane of Doom by 4/8%.
[Pandemic] (Affliction, Tier 6): Reduces the global cooldown of your Bane and Curse spells by .25/.5 sec.
[Impending Doom] (Demonology, Tier 3): Increases the chance for your Bane of Doom to summon a demon by 10/20/30% when it deals damage.
Prior to Patch 4.0.1, Bane of Doom was known as Curse of Doom. Once cast, it marked a target with a 60 second debuff. It damaged at the end of its count down, and had a small chance of summoning a Doomguard, which would need to be Enslaved. The spell could not be cast on players, was unable to crit, and had a 60 second cooldown.
Patch 4.1.0(2011-04-26): Imps summoned by Bane of Doom now benefit from the warlock's stats.
Patch 4.0.3a(2010-11-23): Damage has been reduced by approximately 12%.
Patch 4.0.1(2010-10-12): Renamed from Curse of Doom. Redesigned. Now deals damage every 15 seconds for one minute, and has a 20% chance of summoning an Ebon Imp per tick. Cooldown removed. No longer summons a Doomguard.
Patch 3.0.2(2008-10-14):Curse of Doom will only summon a Doomguard if the target yields experience or honor. The chance of summoning increased to 100%.
Patch 1.10.0(2006-03-28): Can no longer be cast on players under control of a creature.