When thinking about a crossover the hardest thing was finding two IPs that had at least something in common AND that were funny when put together.
I couldn't get any inspiration when it suddenly dawned on me: the perfect match, two great harvesters of helpless sentients uniting their powers towards a greater purpose; both aiming at making something greater from the flesh of lesser beings trough destruction and resurrection in a different shape; both serving a tyrannical paragon of their kind that refers to himself with majestic plural.
It was then that I knew that the Prince of All Cosmos and the Reapers were born to be together.
The image above is the would-be cover of this epic sci-fi tale.
I also created a result screen, with Harbinger taking the (fabulous) place of the King to scold us for daring to score less than 100. He's the perfect fit for this role, with all that scolding experience he got while directing things personally and reminding Shepard that (s)he was bacteria in ME2.
(both are best seen at full resolution in the gallery below)