New zeds?

[[}{] Odysside]

I know there are zeds like the fatale and the shiver but what about some new ones? Mainly I noticed there isn't any "area of effect" zeds, the only example I can think of is the spitter off L4D2. Then again would that make it to hard? Or would it be difficult to impliment.
I'd be happy to help if its possible,

Regards.

[Hoshikudaki]

There are a few zeds with AoE, Sirens, Unholy Carolers, Husks, Suicide Jacks and kamikaze clots. Unless you are referring to constant effects like something similar to Molotovs and fire carpet. It can be made, we just haven't considered doing it.