Shoot him? Seriously though, look and listen. He uses the same super activation sounds we do, then will have a colored effect matching the ability he's using. Blue/Stormcaller sound effect - shoots/throws an arc attack that's basically a pulse grenade. If you stand too close, it will continue to hit you for several seconds. Orange/Dawnblade sound effect -pretty much just uses Dawnblade. Watch out for the projectiles. Purple/Haven't been able to hear a specific sound effect - Shield, then creates an area of effect that slows your movement for several seconds after you leave it. If you're getting killed, stay off the top of the area. There's tunnels/passageways that go underneath the raised areas. Use those for cover, but if you hear the Arc super sound, get out of there, because the area of effect is usually enough to hit you inside the tunnel. If you do go up top, stick to the outer edges where there's walls (often with power ammo) that you can use for cover, but keep track of the nearest tunnel so you can make a break for it if you see him charging towards you with his void shield.