Warjack
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Warjacks (usually shortened to just 'jacks, even in-universe) are the eponymous "warmachines" of Warmachine and the Iron Kingdoms setting. They are, essentially, multi-ton, steam-powered robots powered by magical brains called cortexes. They are the direct descendants of the Colossals (Titan-sized steam-powered robots) the peoples of the Iron Kingdoms used to fight back against the Orgoth invaders and then abandoned for being too impratical.
Technically speaking, however, they are only a small subset of the multi-ton, steam-powered robots, which are usually called steamjacks. Warjacks are specialized steamjacks built specifically for war, although some factions, notably the Protectorate of Menoth and some of the Mercenaries, have more than a few industrial robots (laborjacks) pressed into service with some minor modifications and one or more weapons of some kind bolted on, making them basically steampunk technicals.
Warjacks are not particularly bright, unfortunately, so they need to be lead into battle by specialized battle mages called Warcasters or, lacking one, a "jack marshal" who has learned to direct a single warjack with signs and simple voice commands. Over time, the 'jack and the warcaster will bond, molding the 'jack to the warcaster's personality and making it easier to control (or not, in the case of a warcaster like the Karchev). During this time a warjack with become smarter and developed personally quarks, ranging form being more aggressive to being friendly to children. Quite a few warcaster have their own personal warmachine with a name and some unique toys (and in-game bonuses when used together).
As it's often the case with military hardware, manufacturers prefer having several variants of a single chassis rather than dozens of different models of giant fighty robots. Game-wise, this means many warjacks of the same faction are aesthetically almost identical and share the same base stats, but have different armament and special rules according to their role.
Cygnar
Cygnaran light 'jacks are all based on either the irritatingly average Grenadier or the stronger but less agile Charger, while all their heavies, with only three exceptions, share the same base. Almost all of them have both a gun and a melee weapon, but most are more focused on ranged combat. Notable are the Cyclone with its dual Gatling guns, the hunter with its armour-piercing sniper cannon and the aforemontioned Grenadier, which was basically designed as a field mortat that can move after the soldiers with its own legs, dig its own trench and fuck your shit up with a giant pickaxe if you get too close. Cygnarans also fancy themselves as the inventors of the steamjack, and field some of the most advanced models like the lightning-gun toting Firefly and Stormclad.
Khador
According to their fluff, the Khadorans don't have very many cortexes, so they can't make very many 'jacks. As such, they refuse to use sissy light warjacks; all of their warjacks are heavy. Khadorans also don't have much appreciation for aesthetics; all of their warjacks are big, blocky hulks with three-fingered hands, stumpy legs, inhuman helmet-like visages, and a hunch that would make Quasimodo look like a healthy fellow. They're pretty clumsy at landing or avoiding attacks but can take much more damage than other 'jacks and hit like a mac truck. Among them we find the Marauder, that is so dedicated to smacking people around it has pneumatic ramming prows instead of hands, the Spriggan with its long charging lance and dual grenade/flare launchers, the Decimator with its awesome autocannon/giant circular sawblade combo and the Berserker, that is exactly what you're picturing with its dual axes, EPIC RAGE and tendency to short circuit if you give it too much juice.
Cryx
Cryxian light... pardon, "bonejacks" are all based on the same squat, two-limbed design, earning them the nickname "chickens". The only slightly different models are the burrowing Helldiver, the stealthly assassiny Stalker and Lord Asphyxious' pet scavenger, Cankerworm. They are pretty terrible in a straight-up fight and are generally used as vehicle for an Arc Node (a kind of magic repeater that allows warcasters to cast their spells remotely), harrassers or suicide attackers. "Helljacks" tend to be fast, hard to hit, relatively fragile, powerful in melee and subpar in ranged combat. Slayer derivates are similar in design to most other warjacks and offer both simple glass cannons and more support-oriented models, like the harpoon-throwing Reaper, while the Leviathan and its cousins are four-legged weapon platforms with amphibious capabilities. As befitting for a faction of undead, their style favors the skeletal and menacing, with jet-black paint jobs and lots of spikes. Many cryxian jacks are powered by a necromantic engine that runs on souls and at least three carry particularly nasty chemical weapons.
Protectorate of Menoth
The ImperiumProtectorate of Menoth faced a difficult problem with psykerswarjacks: technically they are against the Emperor Menoth's Law since they are powered by vile warpcraft magic, but without them they would be completely buttfucked. So they just rationalize it as a necessary evil, force penitent mages to produce the cortexes and use them anyway. You will immediately recognize a menithe army by the particular blend of mechanical parts and gothic style that wouldn't look out of place in the 41st millennium. Taken alone they are dissappointing, mainly due to the use of older models and converted laborjacks, but just add the combo and synergies the protectorate is famous for and you've really got something. Their light 'jacks tend to be either skirmishers (Dervish), spell repeaters (Revenger) or mobile platform for flamethrowers (Repenter) or crude rocket batteries (Redeemer), while heavies are more suited to direct battles. Of particular interest are the Castigator, who just walks up to the enemy and SHORYUKENs him in the face and the Sanctifier, a Chaplain Dreadnought who exorcises ghosts and evil spirits on the battlefield (by bludgeoning the HOLY shit out of them with a giant crucifix). Ironically Menoth uses a Warjack he himself designed as his Avatar.
Retribution of Scyrah
The Elves of Ios call their warjacks Myrmidons. And are easily the most alien in design (to a point were the art for Myrmidon are 3D models rather than illustrations). Unlike other 'jack Myrmidons are more or less solar powered and come with a powerful forcefeild that wend active allows a Myrmidon to do a number of futures, for firing an laser to running far faster than any other jack.
Mercenary warjacks are almost all old, decommissioned models or armed laborjacks, and it shows. They have low stats like the Protectorate's, but without the Choir of Menoth and their many combos to compensate, and as such they are extremely dependant on focus and their warcaster's buffs to work. They are usually very cheap and do their job decently, without too much flash or show. The Four Star syndicates and the Covenant share most of the same models, chief among them the Renegade, Magnus' pet invention, with a a massive one-shot rocket and a giant chainsaw and the Mule, a jury-rigged mess held together by spit and prayers that nonetheless sports a very powerful steam cannon. The pirates field three converted "sailorjacks": the Buccaneer is a light skirmisher and gladiator wannabee with a net and a gaff; the Freebooter is a weaponized powerlifter that excels at dragging other warjacks to the ground and thrashing them while they're down; and the Mariner couldn't scream "I work on a ship" any louder with its diving-suit-like appearance, anchor in one hand and ship cannon in the other. Rhulic warjacks are slow and sturdy, and include two different moving turrets (one with a big full-auto shotgun), a battering ram with legs and a payload of grenades and a weaponized excavator with enough strenght to punch clean through most other 'jack with its drill-fist.
Convergence of Cyriss
Little is known about the warjacks of the upcoming sisxth faction, the Convergence of Cyriss, except they seem to be more clockwork than steam.powered and they mimic the attack skills and some special rules of their warcaster.
Other Warjacks
The Mercenaries have a variety of warjacks, some of which are based on other factions' warjacks, but many are just laborjacks outfitted with military weapons.