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

Bracers of the Witch Hunter
Bracers of Aeons
Manifold Paradox
Taunt: Pleasant Distraction
Billingsley Loftwright
Infernal Chieftain
Inscribed Blades of Voth Domosh 