Allegiance skill

Allegiance skills are special PvE-only skills available to characters of players who own the Factions campaign.

They are linked to the Allegiance rank title in the same way many skills are linked to character attributes. The higher your rank in a title, the better the effects of all the skills of that faction for all your characters.
They can be obtained in exchange for 3,000 Luxon faction points or Kurzick faction points per skill; they are available from Luxon Scavengers and Kurzick Bureaucrats in Guild Halls and some Factions outposts.
You must have at least rank 1 in the the corresponding title track to learn any skills of that faction.
Although you can acquire all 20 skills of both sides, you can't equip the same skill of both factions. For example, if you equip the Luxon Triple Shot, it will be removed if you try to add the Kurzick Triple Shot to your skill bar.
You can, however, combine skills from both sides, as long as they are not the same skill. For example, you can equip the Luxon Summon Spirits and the Kurzick Shadow Sanctuary.