Affinity Generator Mods can be bought from a special vendor in the Tech Wings of the Watchtower and the Hall of Doom. They provide an additional boost or buff if the player is wearing two (A), four (B), six (C) or eight (D) pieces of elite gear (episode 16 or better).
Pool Generator Mods were initially named Health & Power Generator Mods.
In all other areas of the game, Dominance is blue, and associated with Fortified Exobits. In a generator, it is yellow, and listed with Support Generator Mods.
The rarity of the mods increases with the last number in their name.
Originally v*.2 generator mods were vendor items only. Later this was not handled strictly anymore. There are v*.2 generator mods which merely drop as loot and several tiers which are available at vendors and drop as loot as well.