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The Orruks are a race of Greenskins that populate the Mortal Realms. They are warlike and unpredictable creatures gathered around in tribes scattered across every realm, already infesting them before Sigmar started to explore them. They often clash with everyone including themselves for the joy of battle, but also dominance and territory.
Orruks, like other Greenskins, grow larger the more time they spend fighting. They embody the brutal philosophy that might is right, respecting strength above all else and only the strongest get to be their leaders, which because of their size and the way they used it has led the Ironjawz to be the rulers of their race. After all if someone can snap your neck he is worth following at least so they can see him snap other peoples necks. The more a Greenskin fights the bigger he gets. Many like-minded creatures, like Ogors, Troggoths and Aleguzzlers often join the hordes of greenskins into battle.
Orruks are large humanoid creatures; noted for their thick, wrinkled, and wzxy greenskin alongside an innate love of violence. [4a] [4b]. Underbites are common, as are long tusks dubbed "teef". Orruks are also host to bloodsucking parasites. [4a]
It is written in Dzantaster's Bestiary of Ghur that orruks reproduce by breaking down into fungal jelly upon death, forming strange egg-sacs that draw nutrients from deep in the earth before birthing gangly and toothsome proto-orruks known as “yoofs”. Thus orruks seem to emerge from caverns and fissures when least expected and are difficult to displace once they have infested an area. [4b] Alternative theories include Orruks spreading like fungus, or engaging in sexual reproduction. [4b]
Whilst all Orruk's can be united under a Big Waaagh they find themselves split into multiple typologies; largely based around which aspect of Gorkamorka they most embody. These divisions are believed to be caused directly by the splitting conflicts of Gorkamorka. [4a] However, some unifiying elements remain, such as a love for violence and a desire to follow the best boss. Bosses are typically determined by might, but around 20% are chosen for finding the best fights or general unning. [4b]
Predominantly worshipers of Mork, the Kruleboyz disregard notions of honour and pride themselves on underhandedness. [4a]. They are proportioned differently than other Orruks, with longer more sinewy limbs. [4a]  They predominantly occupy swampland; making ample use of the multiple beasts found there as weapons of war, and utilising magics to summon mists and swamps arround them. [4a] 
IronJawz are followers of Gork who pride themselves on fighting anything larger than them. They adorn their hulking bodies in vast quantities of pig iron and make extensive use of Gore-Gruntas and Maw-Krushas [4a]
Bonezplitterz find themselves attuned to the spirit of Gorkamorka predominantly. Their lack of armour, and strange beliefs, give them a great source of protective power but alienate them from other Orruk clans. They believe that the spirit of Gorkamorka and the realms lies wtihin bones, and that by consuming the marrow they can embody this power. Confidence and agression, combined with these bone magics enhance them greatly. [4a]
Savage Orruks are superstitious barbaric tribes that follow 'da old ways', forgoing any form of advancement and favouring tradition. Their approach to life is so atavistic they refuse wearing any equipments and weapons made of metal. These tribes are distinguished by their near-nakedness, ritual piercings, garish warpaints and strange fetishes.
- The [Orcs and Goblins] compendium lists some of its models as Orruk.
- 1: Warhammer: Age of Sigmar, The Green Hordes
- 2: Grand Alliance: Destruction - Ironjawz, pg. 18-19
- 3: Everything You Ever Wanted to Know About Orruks (and More!) in Warhammer Community Website
- 4: Battletome: Orruk Warclans (2021)
- 5: Dominion