Mercenaries of zaeed
The servants of the mercenary god Zaeed are perhaps the some of the most easily summoned creatures in the Warp - fitting for the mercenary god, as his domains focus almost entirely around spending coin, in whatever form one can, for temporary help. His old alliance with Yharim allowing him to invest the vast majority of his power into his servants has resulted in a bewildering array and number of servitors, and the services of Valanar has seen them unusually well armed. The vast majority of his servants where at one point mortals, either followers of those whose souls were offered up by contract. While some strong souls will persist, earning fame and glory, most will soon degrade, becoming a nameless soldier without identity of individuality to be summoned and shaped. Below is a breakdown of the primary forms of Servitors that can be conjured.
Despite the majority of a given grade of servant being essentially identical, the shape they where can be to a degree altered, for a price, allowing troops to be specialized for the environment or need. Typically the more potent the demon, the more or greater specializations it can be given.
An exception to this are his Regiments of Renown. Entire units of demons who have held onto their sense of self, they are typically both more effective and more expensive than other demons of their power. It should be noted that such regiments negotiate their own contracts, and to persist as individuals they must always be able to pay their mercenary lord his cut. As such conjuring them can carry many of the risks of bargaining with any mercenary company, while their contracts are binding, that can be far less a boon than it appears.
Cannon Fodder
The lowest of Zaeed's forces, cannon fodder are child-sized creatures bearing low-power firearms (usually las pistols and weapons of similar strength, though occasional fodder may wield impaler pistol or equivalent) and/or simple melee weapons. They are little threat individually to even a moderately skilled soldier, but they can be cheaply called forth in vast numbers. Despite their immortal nature, they are still prone to break and flee like mortal troops, if somewhat less inclined to than most troops of such low quality. That said, they are still warpspawn, and thus take more killing than a creature of their size should. They are vicious, cunning and prone to looting if not closely watched. The saving grace of such troops is the ritual to summon them is constant. Once started it can be maintained for days or weeks with little more effort. So long as the ritual is maintained, any servitor destroyed will crawl back out of the portal in minutes, allowing them to bog down even determined assaults that cannot banish them quickly enough.
Regiments of Renown
Hearth Guard: a militia unit of an unknown race that turned mercenary after the destruction of their home. Unusually large for cannon fodder, they are almost as tall as humans. Vague memories of their former purpose steels their resolve when fighting to protect civilians. This unit specializes in defensive siege warfare, and can be trusted not to harass civilians.
Cannon Riders: a fearless band with an unusually literal take on the term "cannon fodder". The Cannon Riders wear heavy armor that they can tuck into a covered sphere, allowing them to survive being fired out of their custom made cannons. In battle they rely almost entirely on melee weapons, as they are usually fired directly into enemy formations.
Bastard Boomers: in life, they were a xeno species known for extreme numbers, and a desire to die spectacularly. In death they are much the same. Small but surprisingly fast, boomers are capable of spectacular self detonations. The force of the blast varies, with the larger and more high ranking boomers posses more potent detonations. While unlikely to close the distance in an open battlefield, more than one regiment has been wiped out by a sudden ambush of self immolation.
Ditch Diggers: "Siege engineers" and ambush regiment both, Ditch Diggers are capable of rapidly constructing extremely crude fortifications through and on nearly any terrain. Of more interest to most is their ability to burrow themselves and attack from beneath an enemies feet.
Hired Guns
Undisciplined rabble. Hired guns appear as soldiers of a bewildering range of appearance. Anything from flaming skeletons in flak armor, to unassuming guardsmen, to demonic beasts in military fatigues. It is often possible to tell what race they were in life before their forms began changing, but this is not always the case. Their actual level of skill varies wildly, with some being little more than well armed conscripts, and others surprisingly deadly. but as a unit, they typically lack any discipline or coordination. In terms of armament, they usually have equivalents to impalers, with a smattering of more exotic and heavier weapons. Much like cannon fodder, they cannot be trusted not to harass civilians and steal what they can get away with if not closely watched. However they can be cheaply called up, and against foes who can merely banish them, are extremely unlikely to break.
Regiments of Renown
Gratlock's Mankillers: a group of Tarallian Dog Soldiers in life, filled with a near insatiable bloodlust for killing humans, in death their hatred has been scarcely tempered. Ferocious and utterly without fear, they bear potent short ranged weapons into battle. Against humans their fury reaches heights beyond mortal limits as they call forth their hate. A potent but undisciplined force, prone to unordered charges and refusing orders to disengage from their hated foes. While they will work for humans if paid handsomely, it is advisable to keep them well away from any allied human units or civilians.
The Beast Pack: formerly a Kroot clan, this group degenerated into various animal creatures after some poor decisions on the part of their shapers. Making a deal with Zaeed, the Kroot continue to consume even after death the shapers trying to reignite the spark of sapience in their charge's eyes.
Beskar's Breakers: a regiment from an unknown species, the Breakers are a berserker like formation that throw themselves into battle with a feral ferocity. Perhaps because of their animalistic nature they have been shielded from the wrathful gaze of Khorne.
Soldiers of Fortune
The defining feature of a Soldier of Fortune compared to a Hired Gun is discipline. While they appear in a similar dizzying array of shapes and forms, any given formation will be of the same sort of creature. Often there will be variation within the theme, Soldiers will take on different appearances relating to a specialty. For example, a unit of flaming skeletons will have larger ones meaning heavy weapons, and more ornate ones as officers. This is the level where it is possible to summon formations that include daemon engines, though at significant cost. Aside from discipline, the primary difference between Soldiers of Fortune and Hired Guns is the quality of their kit. Most are equipped with carapace-tier armor and a variety of weapons comparable in power to the pulse rifles of the T'au.
Regiments of Renown
Jobbo's Giants: an ogryn formation of massive size directed by their Commissar Jobbo, an extremely large man in his own right. Not particularly intelligent, but once they start moving in a direction little can stop them.
Schooner's Scorners: as renowned for their stubbornness as their black tongues these soldier's insults are almost as deadly as their guns to their enemies. More than one battle has been won by a particularly well directed insult causing the enemy to abandon an advantageous position into the fire of the mercenaries.
The Flamebound: consummate pyromaniacs best used for when the foe does not require the careful taking of positions and when casualties are not an issue. Baring customised and enhanced flame weapons into battle the Flamebound march fearlessly into their eternal fiery graves for a price. In fact the marching is the problem as they can sometimes seem a bit too enthusiastic about returning there.
The New Flesh: the work of a mad heretek who spurned the Dark Powers in exchange for a less demanding patron. It is unclear of these twisted mockeries of the techguard are truly demons, or merely constructs capable of being summoned. The vat grown beasts combine human and xeno genetics and technology to create formidable mindless combat cyborgs. Fearless, obedient and disposable they march from hidden creche labs to earn coin for their unseen maker. They are a potent if inflexible and ponderous force.
Dogs of War
Dogs of War are Zaeed's most potent servants. They often appear covered head to toe in intimidating form concealing armor of some stripe or another, be it skull-faced carapace armor, sleek synthskin, or even bony exoskeletons. However exceptions exist, often ones that appear visibly demonic or otherwise intimidating. They are universally the idealized image of merciless, faceless, and professional killers. Skilled, trustworthy, and utterly disciplined Dogs of War are well worth the high price of calling them forth. The armor is significantly more potent than its appearance would suggest, as each set is blessed by the slave smith Valanar. While not as durable as the blessed armor of the Adeptus Astartes, they are a match for most mortal-borne suits of power armor. The weapons wielded are both potent and strange, often a match for neutron lasers.
Regiments of Renown
Brigshire's Bastards: an extremely old mercenary band. In life they were a regiment of rebellious stormtroopers who turned rogue and formed a mercenary band. Cut off from the light of the emperor, they eventually fell into worship of Zaeed. Ultimately they were slain by an Inquisition strike force, but their souls had long been bought and paid for by the mercenary lord.
Targon's Toughs: an extremely diverse band of mercenaries including over a dozen different xeno species. Known for wielding weapons and armor potent even by the standards of the Dogs of War, and the tactical acumen of their offices. The Toughs have persisted as both a demonic and mortal mercenary band for centuries, with their best and brights serving on in the afterlife.
Velronthar's Rangers: Velronthar was a supremely overconfident Eldar Ranger who made a deal with the God of Mercenaries. He failed the deal and paid the price, himself and his group sworn to Zaeed for eternity.
Cinder Guard: in recent years Zaeed has been doing a great deal of business with the tau empire, often selling aid in exchange for fire warriors agreeing to years of time in his service. Those that die before fulfilling those terms will find that such things of little note. The skill and gear of fire warriors married to a warpspawns' might has produced a deadly and growing force.
The Magnificent 20: A group of 20 psykers ranging from the gamma-eta classification. Guarded by a fanatical group of bodyguards, this skilled choir can be yours for a "reasonable" price.
The Coin-sworn Cabal: A vast force of Drukhari raiders and warriors, the Coin-sworn are made up of many of the dark eldar who have fallen into the employ of Zaeed over time. Ruthless, heartless and eager to take payment in flesh and souls many cruel and deranged employers have purchase the services of the Coin-sworn. While the entire cabal would be near prohibitively expensive, they eagly rent out sections of their forces.
Legions of Legend
The absolute pinnacle of the forces available for hire. Such is the potency of these units that there is no "common" form available. Each band is unique and storied. The cost of hiring these units is immense, as even the least of them commands a vast price. However, they are uniformly well worth the cost. Such is both their price and potency, that many will hire themselves out piecemeal, allowing potential customers to summon either part of the unit or even only a single member.
The Eternal Company: While there are multiple Astartes bands among the Legions of Legend, the eternal company is by far the most skilled and storied. 100 Astartes, each a former captain from a mercenary chapter in life. They command an immense price but are by far worth it.
Kor'La Sha'draig Shi'rax's Cadre: Commander Farsight is the most famous Tau renegade, but there have been others. Kor'La in life was a suit pilot Ace, who led Ais Cadre of suit pilots into mercenary life, eventually falling into Zaeed's service. Piloting warp-forged battlesuits into battle, they are a potent and nimble force.
Legio Chrimirs: A staggeringly expensive regiment, but a dozen divinely blessed titans is indeed worth the steep price. How such a force came into the employ of the mercenary god is unknown, but in recent years their god machines have been growing ever more advanced.
The Twisted: a large, ever-charging unit of terrifying wracks, pain-daemonengines, and warpflesh-wrought abominations. Lead by an ancient Haemonculus who grew bored with twisting mere mortal flesh. He now distorts and molds the very souls of those unfortunates he takes as loot or payment. Creating every more potent demonwracks to charge an ever greater price.
Bettys behemoths: a formation of heavy and super heavy tanks. Ranging in sizes from leman russes to baneblades, and including a wide variety of human and xeno designs. Betty's behemoths spelize in combating enemy armor, and will usually charge far more if their employer is unwilling to provide an infantry screen. While vulnerable to infantry unsupported, they are devastatingly effective against armored formations, and are able to threaten even small titan formations if deployed en mass.
Lone wolves
A loose category, this is for unique mercenaries that are not part of a larger band, and instead, hire themselves out as single soldiers. Many of them are skilled infiltrators, pilots, daemon engines or other such specialists. Though what few who are simple combatants are often immensely deadly.
Crypter: a pilot of immense skill, Crypter has turned the tide of entire wars. Unmatched at both clearing the skies and striking from on high. Legendary for taking apart formations one machine at a time, be it enemy air wings, superheavy dropships or marching titan maniples.
The Professional: a mute figure clad in pitch black armor known for absolute professionalism, and always fulfilling the letter and spirit of any contract. A skilled assassin, saboteur and infiltrator his skills and reputation allows him to demand a high price.
The Numinous: An incredible rarity in the galaxy, an Alpha-level human psyker born beyond the light of the astronomicon. Normally such a fate would have been the herald of madness, insanity, and daemons, but the child who would become the Numinous was born pure of mind and soul, enabling them to hold the daemons of the warp at bay for a time. But alone and isolated they had little hope of mastering their power, until a new voice made them an offer. The blessing of sanity and control was costly for the mercenary god, but a cheap price for so potent a follower. Bearing an admirable hatred for daemons for their depredations upon their mind, the Numinous took every chanice they could find to slay them for coin, meeting their end permanently slaying a daemon prince of Chaos Undivided. In death they are much the same as they were in life, eagerly taking contracts to strike at the hated slaves of Chaos, their power now amplified by their new warp spawned nature.
Serial Peacemaker: Although Zaeed primarily deals in ground based mercenaries, he still offers the services of fleets of enhanced ships, and none are more infamous than the Serial Peacemaker. Whatever its origins are have been lost to the mists of time. Was it an alien vessel? Human? A space hulk? Some antediluvian construct from a time long past? Nobody knows, only that it has served so many masters who each made their own improvements and modifications that it is a marvel that the ship works at all, never mind incorporating all of the individual components together to create a seamless and utterly devastating whole. When did the ship stop serving the mercenaries of Zaeed in the materium and instead join its Lord in the Immaterium is unknown, but to summon the vessel is to command the power to gain a flagship able to contend with entire fleets… assuming the price can be paid.
@Durin a list of mercs for the mercenary good.
thanks to @Doomed Wombat for the half or so he came up with.