A Kurzick or Luxon skill is any skill tied to a character's progress in the allegiance title track. There are currently 10 such skills, one for each profession.
These skills are PvE skills, and thus differ from regular skills in many ways. First, they cannot be used in PvP; all Kurzick and Luxon skills are marked as PvE-only. This means that they cannot be unlocked on your account and thus cannot be learned with Skill Tomes. Secondly, they cannot be used by heroes. Finally, they are generally more powerful than standard skills.
There are two separate icons for each skill depending on whether it is the Kurzick or Luxon version of the skill. The Kurzick skills are tied to the Friend of the Kurzicks track and the Luxon to Friend of the Luxons. It is not possible to equip skills from both the Kurzick and Luxon title tracks at the same time.
Skill icons shown below with a blue border are Kurzick, while skill icons in red borders are Luxon.
Enchantment Spell. For 40...60 seconds, your elemental attributes are boosted by 1. Each time you cast a spell, you gain 1 Energy for every 10 ranks of Energy Storage and are healed for 100...300% of the spell's Energy cost.