User blog comment:AquilaeAltair/Ons Theories. First Theory (S3) - The black matter, something that adquired a physical form/@comment-36009152-20190606235427/@comment-36009152-20190620173457

The thing is it began as insane and now we are only just finding out the extent of the madness!

So Sika Madu was searching for someone who could survive Yu, and getting that in Ashera wanted someone to survive him… all points to him trying to create powerful beings but not ones stronger them himself, just tools to use but for what purpose we are not told since he is already the most powerful being shown. Seraphs would have been his only competition and yet he has one that he is able to manipulate, so much for that. The black matter may allow him to do that and might also be the means for him to have become a demon to make possession of humans feasible. The possession substance has demon written all over it, and yet wonder if Sika Madu created it or simply found it in a random field or something XD

With getting a strongest weapon in Asuramaru, to then have that come into contact with Mahiru, who may very well be another black substance creation, does again raise the question of what he wants them for.

Also thought that those with the seraph gene would have a greater affinity with demon weapons and be able to master them quicker. Guren wanted them to help bring down the Hiragi family but that’s all up in the air with the twisting storylines going on.

Can definitely see Tenri and Kureto just viewing Shinoa as this non-human shadow thing for real. Wonder what they make of her if she is and they know for certain that Shinoa is essentially a human weapon, don’t for a minute think that Tenri or Kureto would expect now to be the time that Shikama Doji would leave the heads of the family to move onto someone who has always been before them.

Shinya is more than likely to have been kept in the dark about the experiments, there is quite a lot that he is unaware of simply because Guren does not tell him for his own safety. Wouldn’t out rule that the black matter is responsible for the fate of those kids, it has nothing but ominous vibes about it. It may just be unintentional side effects of it interacting with humans, it can do what it does with a seraph for example because they are strong enough to weather it maybe.