The Felguard acts as a 'permanent' pet, unlike the Doomguard and Infernal. This minion, like the other permanent minions, will receive a random name that can be changed by visiting a Demon Trainer.
As a warlockpet, the felguard possesses five abilities that help it excel in combat. [Legion Strike] is its basic damage ability to help it cause damage in addition to its melee attack. [Pursuit] helps with catching up to enemies. [Axe Toss] is a long ranged, instant stun with a relatively short cooldown. Felstorm does very good damage, and generates decent AoE threat. Lastly, Avoidance helps mitigate incoming AoE damage.
A sweeping attack that does 130% of the Felguard's weapon damage divided among all targets within 6 yards. The Felguard's current target is also wounded, reducing the effectiveness of any healing received by 10% for 6 sec.
The Felguard recklessly swings its weapon, striking all nearby targets within 8 yards for 100% weapon damage every 1 sec for 6 sec. The Felguard cannot perform any other abilities during Felstorm. 45 sec cooldown.
[Demonic Empowerment]: Increases the Felguard's health by 20%, its Haste by 50% and its damage dealt for 12 seconds.
The voiceovers for the Felguard were originally recorded by Blizzard for the Doomguard which originally was summoned as hostile to the warlock until enslaved, and again once the enslave broke. The voiceovers make more sense when this is taken into account, especially the spell cast voiceovers, where the Felguard appears to be threatening the warlock with death repeatedly. This would also explain the quote "What happened to your friend?", as summoning a Doomguard used to kill a random party member. The Doomguard has since reclaimed its voice upon summoning, or rather now shares it with the Felguard.
The Felguard appears as a rare card for the Warlock class in Hearthstone. The flavor text reads: "Yes, he'll fight for you. BUT HE'S NOT GOING TO LIKE IT."
Patches and hotfixes
Hotfix (2016-09-23):Felguard attack power increased by 10%.
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[Summon Felguard] ability.
[Legion Strike] is its basic damage ability to help it cause damage in addition to its melee attack. 
[Pursuit] helps with catching up to enemies. 
[Axe Toss] is a long ranged, instant stun with a relatively short cooldown. Felstorm does very good damage, and generates decent AoE threat. Lastly, Avoidance helps mitigate incoming AoE damage.
[Void Reflexes] (Passive)
[Demonic Empowerment]: Increases the Felguard's health by 20%, its Haste by 50% and its damage dealt for 12 seconds.
Hotfix (2016-09-23): Felguard attack power increased by 10%. 
Patch 6.2.0 (2015-06-23): Model updated. 
Patch 4.0.3a (2010-11-23): Legion Strike now reduces healing by 10%, down from 25%. 
Patch 3.0.2 (2008-10-14): Health increased by 10% 
Patch 2.0.3 (2007-01-09): Melee damage has been reduced. 
