Lumi and posh were the people I saw use it early in ttk in pvp. I don't think either "invented" anything. A grenade doing lots of dps, and a grenade that prevents you from leaving an area and does dmg. Pretty straight forward idea. You don't see it alot because for some reason people are still focused on invis. Invis smoke was cool for drifter, but envenomed is still buff on that map. It's good. Nightstalker is one of the best classes in neutral, and has two grenades without a giant focus on the super. It's a unique class. One of the only ones where 100% disc/str can be found. Shade step disjointing grenade tracking is a bit much imo.