Suishen is an intelligent artifact Katana containing the soul of the first Amatatsu emperor of Minkai.
Suishen has been used to kill one Oni.
It's current stats are:
+2 Ghost Touch, Flaming Katana.
Intelligent: Speech and Telepathy (Common and Tien)
Senses: 60’ Darkvision, detect Amatatsu Scions, read languages
Powers: Constant – endure elements. 3/day – air walk, daylight, Resist energy (cold), see invisibility
The CL of spells it casts is the wielding character's level.
It's current value as an intelligent sword (i.e. ignoring that it's an artifact) is 120050gp.