This tool, if right- clicked in the Protector's Enclave will allow you to see Astral Rifts. If you look on your map once you have equipped the resonator, you will find a blue-ish circle that says "astral rift" in it. Go there and there will be an astral rift. Right click the rift to use the resonator on it.
- 40,000-50,000 Astral Diamonds
A device capable of tapping into astral rifts and extracting large quantities of astral diamonds.