Gambit is perfect the way it is, it's a level advantage game mode so if the invader us lower light them you can take him with a bow if you want even with the shield. I did yesterday actors the board and another time when I had 13 motes seen him coming for me and had my badlander ready and took him out again. Just gotta play smart they are easily seen that's what the shield does also so they cant hide in the cut and snipe watch the whole board and protect yourself as you would in normal crucible 1vs4 is tough if the whole team aims at the invader
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Sleeper is also perfect I hardly ever get killed by it in PVP takes time to charge and I have plenty weapons to get them first and move out the way