A few late game weapons do "Virophage" damage which according to the research description does "something bad" to Pandorans and the Disciples of Anu. However, while using these weapons it seems to have no additional effect.
Not sure what the original intent was, but I would assume at least bonus damage to those types. Either way, please make it have it's intended effect. (Nominally, at an appropriate power level giving how late it tends to be discovered.)