There was nothing special about Yuji's domain. It wasn't majestic like Sukuna Malevolent Shrine, which was described to be a work of art by the author when it debuted, and it wasn't described to ...

In the battle against Sukuna, Yuji Itadori progressed quite a lot ... He was then trained in the art of blood manipulation by none other than Choso, and likely also helped by Noritoshi Kamo.