Bloodthirster

Bloodthirsters are the greater daemons of Khorne. They're fuckhueg daemons with wings who carry a giant axe into battle that's capable of hacking platoons of soldiers into mincemeat in a moment's notice. They are also filled with rage and generally considered the most dangerous entity in Warhammer 40,000 that isn't a god or comparable to an Imperial war titan. Yes, you read that right. In all the grimdark violence of 40k, a Bloodthirster is the single most dangerous being to walk the galaxy. That is how fucking dangerous these things are.

To be fair, a Bloodthirster is the Blood God's avatar of his rage, it will maim, kill, burn, split open, break the back of their opponent, drink the blood from their hearts, mutilate, anything that would sate their never-ending battle lust and to glorify Khorne. They are capable of killing virtually anything with their massive axe and strength and they are nearly impossible to stop without at least bringing something the size of a baneblade with similar firepower or the Daemonhunters.

Notable Bloodthirsters

• An'ggrath: Khorne's most favored Bloodthirster, created to replaced Skarbrand. A Greater Daemon for Apocalypse made to rape anything that he gets into melee with. But his fluff sucks as two of the three mentions of him in fluff are of him losing once to Lorgar, the weakest primarch (but still a primarch so it could happen) and an Inquisitor Lord, a badass one (who called him a slave and told him to beg Khorne for mercy when he next saw him), but still! And he only get a kill a few Grey Knights before getting sent back.
• Daemon of Tartarus: A Bloodthirster sealed in the Maledictum artifact by the Eldar of Craftworld Ulthwé. SSSIIINNNDDDRRRIII Myr attempted to use it to achieve Daemon Princehood, but was thwarted by Gabriel Angelos, who destroyed the Maledictum and ended up releasing it. Later spent several years working with Azariah Kyras in trying to destroy Subsector Aurelia in a mass sacrifice to Khorne. Began merging with Kyras on Cyrene, where it was bombarded from orbit by the Blood Ravens. Or the Imperial Guard. Or the Eldar of Ulthwe. Look, we're still not sure who did it, but we know it's dead. Or at least banned for some centuries (the daemon, not Kyras). Actually, not much is known about him period, he only has one speaking role, during which for a daemon of Khorne, he seems rather calm and polite.
• Ka'Bandha: The Greatest of Khorne's servants. he who broke Sanguinius's legs at Signus Prime. Sanguinius later payed him back during the Siege of Terra (if you don't count the time he got payback on Signus Prime) by breaking Ka'Bandha's spine over his knee. He may or may not be the cause of the Black Rage. Reappeared to troll the Blood Angels in M41. Actually, every time he goes up against them he embarrasses himself. The Sanguinor once bodyslammed him from orbit.
• Skarbrand: Once the greatest servant of Khorne, until Tzeentch tricked him into even greater acts of wanton destruction to the point he challenged Khorne himself as he was so angry. Khorne was so pissed that he throttled the emotions out of him, except for rage and threw him so hard that he flew across the Warp for a straight week thus banishing him for pissing Khorne off. Tzeentch like always, just sat on his throne, conjured up a martini glass filled with his poison of choice, and muttered: Just As Planned. Unfortunately, he now kills more in one day than he ever did when Khorne still liked him, so this could be one of the few times Tzeentch played into Khorne's hands. Just As Planned

Trivia

There is confusion caused by conflicts in the canon over whether An'ggrath or Ka'Bandha is the most powerful/greatest/simply best of Khorne's Bloodthirsters, as there is proof to support either side. Don't even get the canon-keepers started on Skarbrand, when he had wings. Considering how nutty Chaos is actually such a confused state of being is hardly not unexpected. It could also be GW and Black Library writers just don't talk to each other and get some common facts straight.