When using empyrean legacy, the final verdict/divine storm combo only calls down a single empryean hammer. According to Hammerfall, Divine storm and final verdict should trigger it. I would expect an empyrean legacy buffed final verdict then to call down two empyrean hammers. As it currently stands, only a single empyrean hammer is activated.
This was tested on both single target and cleave target dummies. In both cases, only a single one hammer activated.