Everytime you attack with your imaple the zodiac ring will reduce your cooldown on one of your skills. So If say vengeance is on cooldown and you have 10 seconds until the cooldown is up (you can use it again), by damaging a mob with impale you are reducing the time needed to wait until you can use vengeance again. This is huge in keeping your vengeance active at all times thus increasing your survivabikity greatly. Impale DH's already do so much damage that the short burst from COE is not needed. I would way rather ensure that my vengeance seethe is active at all times to help ensure I stay alive.
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Main: Impale Ninja- Rift Boss Destroyer
Always looking for new players to push rifts with! Add trigger#11358