Well, with patch 1.23, a new passive ability came into being: the otyugh-nerfing (and somewhat scarab-nerfing) poisonous passive ability given to toadfish, chrys, and others. However, as suggested by ferpisano on kong, why doesn't Bloodsucker and Retrovirus have them? I mean, not only is it logical, but it gives them a slight buff. They are not underused, but they are not overused either. Retrovirus will have something to balance out its once turn of vulnerably, and Bloodsucker could become a better creature CC'er. (instead of being eaten right off the bat by Otyughs)
Discuss constructively.