Board Thread:Lore Discussion/@comment-4092092-20130801070333/@comment-26893431-20170531141514

CarloV3r wrote: Right, so now we've got the "Discerning the Transmundane" quest proving they've got Meric blood and we've got The True Nature of Orcs stating they're Mer. Apart from Before the Ages of Man, which contradicts the fact that Orsimer came from Aldmer, do you have any other sources stating they're beastfolk, or became beastfolk after their corruption? Pocket Guide to the Empire, First Edition: Other Lands And the Loremaster's Archive

Discerning the Transmundane needed something to make a replica of Dwemer blood, we don't know the full details towards the experiments, Falmer, Orsimer, Dunmer, etc. Most of them are not even related to the Dwemer in a direct bloodline, aside from the Altmer -- who are closest to the Aldmer. Perhaps you only needed the blood of one type of Mer, and Septimus just wanted to be sure. We have no way of checking it, since the lore on the cube is lacking.