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[[Image:Tuch.jpg|thumb|right|220px|The {{PAGENAME}} Tuchulcha speaking through the corpse of a dead child]]The '''{{PAGENAME}} Tuchulcha Engine''' is an ancient sentient device and possible [[Warp]] entity. Of unknown origin, {{PAGENAME}} Tuchulcha is part of a triumvirate of similar entities ('''[[Ouroboros (artifact)|Ouroboros]]''' and a third, unnamed engine) which when combined can create a rift that bridges space and time. On its own, {{PAGENAME}} Tuchulcha is capable of extremely efficient, precise, and accurate [[Warp]] jumps.{{Fn|1}}

During the [[Horus Heresy]], {{PAGENAME}} Tuchulcha was discovered by [[Lion El'Jonson]] in the [[Perditus System]] after [[Death Guard]] under [[Calas Typhon]], which also sought the artifact. The Lion prevented [[Calas Typhon]] of the [[Death Guard]] from acquiring the engine for his own twisted ends and was determined to use it to defeat the [[Night Lords]] and their [[Primarch]], [[Konrad Curze]]. Lion El'Jonson began to frequently converse with the Tuchulcha in the aftermath of the battle, confiding with it above all others.{{Fn|3}} During the attempts to breach the [[Ruinstorm]] and reach [[Terra]], {{PAGENAME}} Tuchulcha demonstrated the limits of its abilities. It honestly told the Lion that it could not navigate the storm to Terra on its own, frustrating the Lion.{{Fn|4}}

At some point towards the end of the Heresy, {{PAGENAME}} Tuchulcha became embedded within [[The Rock]].{{Fn|1}}

Much later in the [[41st Millennium]], [[Cypher]] revealed that {{PAGENAME}} Tuchulcha was embedded within The Rock and that the [[Dark Angels]] dark history of [[The Fallen]] could potentially be changed by finding the other two engines and changing history. He also warned that [[Astelan]] and [[Typhus]] both sought the engines as well. Eventually all 3 devices were gathered, and a warp rift was summoned over the ruins of [[Caliban]]. Convinced by [[Ezekiel]] to leave history be and trying to prevent nearby Fallen forces from accessing the rift first, [[Azrael]] destroyed the rift and presumably the three devices.{{Fn|2}}

*{{Endn|4}}: [[Ruinstorm (Novel)]] - — Chapter 4