Editing Tuchulcha (section)

==The Horus Heresy==
During the Horus Heresy, the Lion would come into conflict with the Death Guard under Typhon over Tuchulcha. The Lion prevented Calas Typhon from acquiring the engine and was determined to use it to defeat the Night Lords and their Primarch, Konrad Curze. Lion El'Jonson began to frequently converse with Tuchulcha in the aftermath of the battle. Tuchulcha, of course, was overjoyed at the Lion's return and constantly wanted to know how it could help.

The Lion would use Tuchulcha to enter the realm of [[Ultramar]] through the [[Ruinstorm]] brought on by the devastation of Calth. After joining Guilliman's [[Imperium Secundus]], despite the fact he had only a small fleet and 20,000 warriors with him ''(the rest remaining on the opposite side of the Ruinstorm with [[Corswain]])'' he would employ it to great effect against the forces of the [[Word Bearers]] and [[World Eaters]] who were plaguing the 500 worlds. All the time throughout, Tuchulcha remained fairly reliable and never lied to the Lion, albeit speaking in a cryptic manner.

When the joint visions of [[Konrad Curze]] and [[Sanguinius]] proved the lie of Imperium Secundus, the three legions set out for Terra. Initially leaving separately, the Lion ordered Tuchulcha to take him to Terra, and was instead delivered to the '''Pandorax''' system. The engine later explained that it took the Lion as far as he needed to go, but no further until certain barriers were overcome; it became almost belligerent in its further explanations, saying that the Lion could not go directly to Terra, but could not explain what the barriers were, arguing that it could only see so far and it was not omnipotent.

After picking up some members of the Shattered Legions and getting pointed in the direction of '''Davin''', the Lion called his brothers to him so that he could lead them through the [[Ruinstorm]] together - at which point Tuchulcha [[Troll|noped]] him again and deposited the fleets at a literal brick wall in space, one billions of miles wide and thousands of miles thick, only made possible by being summoned from the Warp and anchored to a conquered Forge World.

The Engine then dropped the fleets in a region of space filled with giant solid blocks, light years in diameter, again summoned from the warp. The three Primarchs realized this was what the galaxy would look like if Chaos achieved its victory. Then Tuchulcha finally took them to Davin, which was surrounded by a boneyard of actual skeletons and ruined buildings, layered millions of miles thick, and it took hours to shoot their way through.

When their business on Davin was completed, the way to Terra was revealed. But the Lion would not go to Terra, because Sanguinius needed a diversion to make it there himself and face his own destiny. So the Lion and Guilliman set about assaulting the Traitor force's rearguard to start drawing them away from Terra and give Sanguinius a chance.