This guide will let you know how to get 120% Slash Mods in Warframe.
Buzz kill and other 120% slash mods can drop as a reward for killing or capturing an Eidolon Hydrolyst which can be found on the plains of eidolon during nighttime after capturing the eidolon Teralyst and Gantulyst.
Unfortunately, the mods do have fairly low drop rates, so it’s likely that you aren’t going to get any of them on your first few runs unless you get lucky.
