The only time where gaining faction with one loses you faction with the other is if you kill mobs that are on one faction or the other.

Note that these two 'opposing' factions are not required to be a one or the other sort of thing. Further details on why you might want to work on your faction in this manner can be found in the RoK Faction From a Tradeskill Perspective guide. After obtaining this faction (so they no longer want to kill you), you can then travel to the appropriate outpost and run crafting writs for further faction. This quest is meant for level 70 crafters, and will reward you with faction for the two factions in the Fens of Nathsar: the sarnak at Bathezid's Watch (+250), and the iksar at Riliss (+1249). If you don't mind a bit of death, some frantic sprinting, and the like, however, read on! If the thought of dodging that many aggro mobs turns you grey, you may be better off sitting safely at home and buying your advanced recipe books from adventurers.

While this quest requires no combat, it does require making your way through Kylong Plains to reach the Fens of Nathsar, and then much running through the Fens. High-level crafters who wish to pursue a faction path (in order to gain access to advanced crafting books, among other things) should begin with this quest, given by Taskmaster Greeblentus in Teren's Grasp (he is in a tent up on the raised area that contains the highest building in Teren's Grasp.) Faction plays an important part in the Kunark experience, as various areas are under the control of groups that don't always like each other, much less total outsiders.

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