The new Cobalt Assembly Reputation in Azure Span rewards players with an Itemlevel 389 ring with an unique proc. These Rings have been proven to be very strong in their current state.
You need to be level 70 to unlock the reputation. Then, head to the Cobalt Assembly in Azure span to pick up Welcome to the Assembly and complete the quick quest chain.
Once you reach High reputation, you can buy these rings:
In order to get High reputation, you just need to farm mobs and loot them. Eventually you’ll gain enough reputation which should take less than an hour in a group.
As you kill mobs, you can also pick up power similar to those from Torghast to help your grind.