muzan turned you into a demon but instead he did smth different with you instead of leaving you, he fused some of the uppermoons DNA with you and a bit of his own making you the ultimate demon. Your standing in a field until the hashiras see you

Gyomei: this demon looks different

Tengen: it does

Sanemi: it cant beat me though

Rengoku: we can beat it

Giyu: it does look strong

Mitsuri: it looks very different

Obanai: it looks dangerous

Muichiro: *stare*

Shinobu: it looks strong