An amusing thought...
Ordo Xenos gets word from IG scouts that a rare example of Necron technology has been spotted outside of Necron control. Somehow, impossibly, it hasnt vanished into thin air like every other bit of Necron tech the Imperium have tried to study in the past. The Acolytes must acquire it at any cost as it will push forward AdMech understanding of the most advanced of mankinds enemies by literally centuries.
The catch is.... Its a Looted Monolith in the middle of a giant Ork Waargh- the Ultimate ZZzzzzap Gun of an Orky Mekboy Warboss! Its his pride and joy since Orky nose-how kept it from phasing away!
(Inspired by this
SJE
. Besides IIRC from the fiction in the Necron Codex it is implied that they use some kind of Dimensional Warping (not to be confused with the Immiterium), and aside from the gates most Necron tech is just solid metal. Besides the Orks can't even get a Titan done without it looking like a trash heap
.