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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, usually taller and broader than a human, noted for their thick, wrinkled, and waxy green skin and innate love of violence. [4a] [4b]. Underbites are common, as are long tusks dubbed "teef". Orruks are also host to bloodsucking parasites. [4a] Orruks are both metaphorically and literally thick-skulled, but can show surprising cunning.
One theory of Orruk reproduction, written in Dzantaster's Bestiary of Ghur, is that when Orruks die they break 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 Orruks 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 unifying elements remain, such as a love for violence and a desire to follow the best boss. Bosses are typically determined by might, but around twenty percent are chosen for their cunning.[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 magic to summon mists and swamps around them. [4a] 
Ironjawz, or Gorruks as several Azyrite bestiaries call them, are Orruks that follow Gorkish values and 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][4c]
Bonezplitterz, also called Savage Orruks, find themselves attuned predominantly to the spirit of Gorkamorka. Their approach to life is so atavistic they refuse to wear any pieces of equipment or weapons made of metal. Despite this, their strange beliefs give them a great source of protective power, though it can alienate them from other Orruk clans. They believe that the spirit of Gorkamorka and the Realms lies within bones and that by consuming the marrow they can embody this power. Confidence and aggression, combined with these bone magics enhance them greatly.[4a]
- 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
- 6: White Dwarf November 2018