Upon activating, the Ketsuryūgan makes the user's eyes glow bright red sclera, dark red irises, and white pupils shaped as horizontal rectangles. This dōjutsu confers genjutsu casting abilities, either by making physical skin contact with the target or meeting each other's gaze. Upon which, they can hypnotise the victim in a variety of ways, or even delve deep into their minds to extract information. The Ketsuryūgan also gave the users the ability to manipulate iron, or more accurately, anything with a high iron concentration. As such, fitting with its moniker, the Ketsuryūgan can manipulate the blood within a living target, whether it be themselves or another being.