I do not know where to acquire the hammer and shield yet; I used the console to get them and level them up so I could plan my builds.
When you first bind the hammer, it is Legendary and has +10 Accuracy, +50% damage against the Eyeless, as well as a Destroy Eyeless proc. Those are not named abilities and are just listed as is.
To level it up, you need to kill the Eyeless I believe (it says "release the fragments of Abydon trapped in the Eyeless" or something). Then it becomes Mythic, loses any Eyeless-related abilities and gets the fancy ones.
Will post the details after work if nobody does it first.