[1.7.2] Blighted Summoning for Necro's Ghouls too weak

[Potkeny]

Blighted Summoning gives Virulent Disease (and Bone Shield) for Necro's Ghouls, which applies when they do non-disease blight damage.

But those ghouls have only disease blight damage (Rotting/etc. Disease) until they get Retch (they do get it after lv3x, right?), making the prodigy weaker for ghouls compared to every other summon early (who get Shield, Virulent Disease, and 10% blight damage conversion or the special talents for wilder/necro summons).