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: Raging Bull
Taunt: Order Up!
Twilight Schism of the Crimson Witness
Masque of Awaleb
Solar Forge
Vengeance of the Sunwarrior
Pauldrons of Eternal Harvest
Silent Wake
Double Vision
Featherhutch
Mantle of the Whispered Bond of the Crimson Witness
Fractal Horns of Inner Abysm
Inscribed Mace of Aeons
Taunt: Celebration of Death
Elder Staff of Faith
Genuine Bloodfeather Wings
Loading Screen of Eldritch Gnarl
Taunt: Doom Shreds
Genuine Entropic Battlegear of the Warrider Set
Ward of the Phoenix
Wide Angle
Origin of the Unmaking 