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The Orkoid races are believed to have been genetically engineered millennia ago. Ork legend attributes their creation to the [[Brain Boyz]], a diminutive but extremely intelligent subspecies of Orkoid, who bred the Gretchin to be servants and the Orks to be warriors.{{Fn|1a}} Later evidence establishes that the Ork races may have in fact been created by the [[Old Ones]], who are described as creating the ''Krork'' as part of a last-ditch attempt to fight off their enemies such as the [[Necrons]] and [[Enslavers]].{{Fn|5}} Krorks were hulking brutes reaching nearly twelve meters tall that wore sophisticated armour great even by the standards of the Imperium during the Horus Heresy.{{Fn|12}} The Orks have had a presence in the Galaxy since that time of [[War in Heaven (Necron)|War in Heaven]], and are known to have first battled [[mankind]] long before the foundation of the [[Imperium]], tens of thousands of years ago during the [[Dark Age of Technology]]. According to legend, the Orks were one of the very first alien races encountered by humanity - when the first ork and man met on some forgotten airless world long ago, they took one hard look at each other, drew pistols, and shot each other dead simultaneously.{{Fn|38}} Humanity and the Orks have fought innumerable conflicts over this time since then and are unlikely to ever stop.{{Fn|5}} It is said that of all creatures, humans remain the Orks favorite enemy to this day.{{Fn|38}}