Sure he looks cool, but hes deadly! Damned attacks hit unusually hard and unusually fast for a Gob, also it is to my knowledge that it drops at least one rare-ish item every time, be it a Relic Armor, or a Relic weapon. Dont take this seriously though, this is only in my experiance, and i cannot confirm that he always drops something so dont quote me! lol. just talking from personal experiance
From my personal experience... I don't think I've ever seen NMs drop AF2 or relic weapons. XD It only ever seems to drop from the regular mobs. But all mobs (NM or not) have an equal chance of dropping any of the items available in Dynamis (in the first 4 anyway... I dunno if it's different in the Northlands, as I haven't been there yet).