Well, as it is Reiatsu-based, I would suggest energy-based attacks. Think of Yumichika from Bleach, his blade was a Kido-based weapon that allowed him to make whips of energy. Since your weapon's name has poison in it (unless you really meant posion), I would suggest it being something along the lines of a paralyzer, like something that would make a limb go numb. Anything else would suggest would be more of the poison-type then Reiatsu.