ADT (Alien Dark Tide) : Alien Dark Tide, a total conversion for Myth II based on the Alien movie(s).
COD : Coming of the Dark
GB : Green Berets
LoGA : Legend of Gor Ash
RDF : "Rocket Dorf Fest", a 3rd party conversion consisting of super-powered dwarves and ghols. Some dwarves shoot rockets, some fly and lob small stunning fireballs.
Source of the Five Hundred Poisons : The Deceiver's surname.
wwII, ww2 : A popular myth conversion that changes all the units to world war 2 era soldiers and or vehicles).
While WW2 can be a divisive topic in the community, it is by far the most widely played conversion