In Rappelz, it will mainly compliment Assassin class' ability to cloak, but has potential to beuntilized effectively by most melee or pet classes also.
Tier: 3 or 4
Skillset:
Essence of Invisibility - Identical to the Assassin "Cloak of Shadow" (lvl 10)

Shadow Illusion - Decreases Threat of all attacks.

Threatening Essence - Increases Threat of all attacks

Dual Weapon Mastery - This skill(Rappelz Rupees) allows the Phantom to dual wield Dual Swords, Dirks, and Axes. Each new level(Rappelz powerleveling) increases attack speed. (lvl 20)

Bloody Ghost Dagger- When invisible, attacks the target with 5 quick hits. (lvl 30) (2 sec cast, 45 second cooldown)

Armor Passive: Hunter Unit. Adds 10% Max HP (lvl 40)

Unity: Phantom - Increase the pet and players P.atk and Accuracy (lvl 45)(mini-cerb unity)

Weapon Passive - When equipped with Dual Swords, Dirks, or Axes, Atk speed is increased by 10%. (lvl 90)

Phantom Strike - An attack that mimics the effects of "Assassin's Impact," this skill performs 10 quick strikes in a row. Instant cast. Cooldown is 1.5 minutes.(lvl 90)