How do I use any of their grenades effectively? I can't kill with any of them. Help is appreciated.
Edit: pvp
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Axion bolt is my grenade of choice. It will usually kill anyone with 1/2 sheild or less. It can also lead you to somebody who you know is hiding around the corner. If you add bloom to it and voidfang vestment you can get alot of multi kills especially in controll.