Kit looks great. 2 is the easy pivot point for survival Helminths. 3 looks absolutely incredible, especially if it's an ongoing curse rather than a one-and-done style like MfD. Be interesting to see how his 4 scales off duration.
Honestly, melee crowd control is a cool idea, and being able to spread heavy attack nukes around makes me a little bit Tyl Regor. My one nitpick is that a CC buff on a heavy attack frame is very... wut. Why not CD? Melee always needs more CD.