Yuji Idtadori: EOS power-level

So how strong exactly is Yuji?

We know he has RCT, Dismantle, Blood Manipulation and etc.

What exactly is his domain?

It really bugs me... What he did with his domain... What it does.

The actual question is what's Yuji's domain and it does. I am not at all interested in his power level.

(Used such a vague title so that anime-onlys don't get spoiled)