This poison is deadly.
Webinsect breathing is a breathing style that mimics insects, specifically their lethal stings and movements, and replicates it with user's movements, techniques and abilities.
Webgiven that shinobu isn't the most physically imposing slayer, her sword power technique is instead based on speed, with insect breathing relying on her.
Webwith her insect breathing, shinobu skillfully combines the motions of venomous and stinging insects into her skills.
Webdespite having great speed to float like a cadillac and sting like a beemer, shinobu have the worst physique among the hashiras.
She's so weak that she's unable to behead.