How traits are balanced is completely re-visioned in the new MassiveTrait system, which is being tested now. If things stay as they are presently, one will be able to choose fire resistance, lava swimming, heal in lava, and satiate in lava and then choose any of the possible negative traits to balance the point cost. Of course there will also be the possibility that one doesn't have all the traditional Dakkar traits. Maybe you are a half-breed, you're a Dakkar that never learned to swim, or some of your traits come from the study of magic. The trait system does not require a lore compliant approach to choosing traits, but remember that use of traits in roleplay in Regalia does, so you will need to choose traits accordingly for your needs.