Weapon evolves by earning points. Any match won using Phantom Assassin will earn you 1 point. Earning 40 points will upgrade the weapon to Level 2, and earning 100 points causes the weapon to reach its maximum evolution.
Hero
Phantom Assassin
Slot
Weapon
Rarity
Arcana

Taunt: Order Up!
Apogee of the Guardian Flame
Astral Drift
Treasure Upgrade Infuser - Winter 2016
Genuine Serrakura
Vengeance of the Sunwarrior
Dancer of the Spiteful Eyes
Unusual Stumpy - Nature's Attendant
Auspicious Speed Demon
Mantle of the Whispered Bond of the Crimson Witness
Golden Piscean Pulverizer
Taunt: Party On? Party Off!
Spider of Purple Nightmare
Masque of Awaleb
Inscribed Black Pool Watcher
Obelisk of Foresight 