Lori Delta Tove
Lori Delta Tove is a planet sized Necron machine which has the ability to teleport between the stars at will and cause strange happenings wherever it appears, such as memories changing, ancient scrolls rewriting themselves and even planets shifting in their orbit - these occurrences appear as if history is being rewritten.
Lori Delta Tove was located by an Explorator fleet in 774.M41. Believing it to be somehow connected with the Warp, the Imperium dispatched three squads and a Strike Cruiser of Grey Knights under the command of Grand Master Mordrak. Upon making planetfall, the Grey Knights quickly realised the true nature of the planet as its Necron inhabitants awoke from their intrusion. Initially gaining the upper hand in the battle, the Grey Knights had to quickly revise their plan when mysterious equipment failures begin occurring. Following the instincts of Master Armourer Torvin they fought their way to a central control complex where they mined several critical systems with melta bombs, which they detonated moments after teleporting off the planet to safety. However, Lori Delta Tove simply vanished once more, and whether it was destroyed or merely travelled to a new location is unknown.