The Shadow's Identity

Ruxley White's sword completely cut off all the retreat routes of the mysterious man in black, leaving him with no way to escape!
Facing the green sword light coming towards him, the mysterious man in black showed a solemn look in his eyes and reached for his waist with his right hand.
clang!
I saw a black dagger appear in his right hand.
This black dagger is about three feet long. The blade is made of some special material. It is pitch black and does not reflect any light under the...