So I played, and while I still think you guys need more skills, some item system ideas:
First instead of having seperate buildings why not have 'tabs' and only one shop? Saves time and makes a one stop shop. Some Item Ideas:
Essence Crystal: (consumeable) If on your charecter when you die you revive in 3 seconds, destoryed when used.
You guys need some more interesting breastplates, most of them either add health or armour:
Null Plate: once evrey xx seconds, negates one negative condition (stun, ice).
But I like the artifacts very cool, but there need to be more equal cost choices in my oppinion.