Aura

Aura probably refers to Elementalist headgear or a boss aura. In addition to other possibilites, it can also refer to certain skills or blessings.

Player skills

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Monster Skills

 * — used by Kurzick Juggernaut's

Blessings

 * Dark Aura — a blessing given by the avatar of Grenth.
 * Aura of Light — a blessing given by the avatar of Dwayna.
 * Lucky Aura — a blessing of unknown effect given by a Lunar Fortune.

Other

 * Aura of the Grove — environmental effect.
 * Boss Aura — Used to indicate the profession of a boss creature.
 * Divine Aura — the bonus property that was included with the Collector's Edition of Guild Wars Prophecies.
 * Elementalist auras — Factions armor.