A Genestealer Aberrant is a type of Hybrid utilized by a Genestealer Cult. They are hideous freaks of nature even by the standards of the Cult, and what causes them to be born into the brood remains unclear. Though dim-witted, their instinctive need to defend their brood makes them valuable assets to the cult. They are massively muscled creatures capable of wielding heavy weaponry with ease. This makes the Aberrants the 'Heavy Support' of the Genestealer Cults, usually carrying heavy mining or industrial equipment, such as giant power hammers, wrenches, or drills to rip apart heavy armor. Aberrants are viewed as essential when a Cult decides to stage an uprising on a Imperial Planet.
Not even the Magus himself knows what manner of strange processes gives rise to an Aberrant. Some quirk of ancestry ordains their fate as the gene-cycle is somehow perverted. Perhaps the initial implantation of the ovipositor was interrupted or spoiled, perhaps the interbreeding happened during a Warp tumult, or perhaps the forbidden dabbling of curious bio-scryers gave rise to monsters that killed their creators upon birth. Whatever the circumstance that leads to their inception, these Aberrants soon seek out the lowest of the cult’s dungeon-like lairs, finding a Magus or Primus who gives them purpose. From that point on, they are used as pure muscle for the cult’s purposes.
Due to the strange psychic resonance from the Genestealer Patriarch, cult members are as fiercely protective and nurturing of these abominations as they are of all the cult's other "children." Thus rather than disposing of them, cultists will often find roles for Aberrants in their plans. They are perhaps the most dangerous element the Cult has, for they are obviously non-human, and should they be discovered the entire brood risks annihilation by Imperial authorities.
Like the Hybrid Metamorphs, some Aberrants may spontaneously mutate as a Hive Fleet draws near. These Aberrant Hypermorphs grow a long, barbed tail that can be used to slice through armor like wet tissue.
With the release of the Tooth & Claw boxed set, the cults were introduced to a new unit in the form of the Abominant - a sort of alpha to the Aberrants. Considering how he looks, his purpose really comes when the time for the uprising arrives and the cult needs a leader to crush the populace. They are often chosen by the Patriarch of a cult to lead their hulking kindred in battle. However, outside of combat an Abominant is just as dim-witted as its fellow Aberrants and needs to be occupied with "playthings" until the cult is ready to stage its uprising, brute force is all the Abominant needs to do its job.
This guy's far bigger and therefore far stronger than his kin, especially considering that he can wield power sledgehammers that could deal more damage than a Thunder Hammer. While he's just as revered by his normal-looking kindred, his most devout followers are his fellow aberrants, who are inspired by his violent fury. He is usually accompanied by a Mindwyrm familiar who acts as an emitter for the Shadow in the Warp and blunts opposing psykers, while also adding a couple of extra attacks in melee.
Tabletop wise, these thing hit like a freight train. Seriously, they did not have gains just to hit like a wet noodle. With at least 3 and up to 6 damage per successful swing and an effective strength of 12 for their Power Sledgehammer, these brutes can easily solo a Dreadnought. They are not to be fucked with at close range.
As a solo model, the Abominant would already be pretty nifty – he’s basically a bite-sized Carnifex – but combined with the rest of your Genestealer Cult he’s got a host of handy abilities. For one, there’s Cult Ambush – which allows you to deliver him to where your enemy wants him least. For another, he’s the perfect leader for a unit of Aberrants due to his The Chosen One ability which makes each unmodified roll on a 6 during the Fight phase for each friendly Aberrant within 6" to score 2 hits instead of 1.