Viral Blade

As a bonus action after melee hit or reaction after being hit you send tendrils of techno organic material into the target within sight 

target must make a constitution saving throw. (DC 10+Charisma bonus)

on failed save target is inflicted with 1 stack of infection up to 3 stacks 

(1) - disadvantage on constitution saving throws made against you

(2) damage (2d4)

(3)target has disadvantage on attacks against you 

successful saving throw removes all infection stacks