Phantom coins are a collectables item, and can be stored to 20 per inventory slot.
Phatom Coins are used to get Necropolis units. It is done through completing various daily quests handed to you by Vampire Antiquary.
|Blackbough: Northen Plateau||3||100 Ghouls|
|Falcon's Reach: Residential District||6||120 Skeletons|
|The Whispering Plains: Ankouhn R'Ash||12||25 Lamasus|
|The Lightlands: Northern Entangled Woods||24||10 Fate Spinners|