These are just a few ideas I had that I think would make him more viable.
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bring back his ability to cook his concussion grenades. The advantage of doing this means that enemies won’t be able to look away in time. It’s just like woth Fragger’s grenade. If you cook it right the enemy can’t escape the blast radius.
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have a small AOE damage near the concussion gender when it blows. This would be just like Skyhammer’s beacon. I don’t think it should be as big or as strong as you’d be able to cook it, but it would make his concussion grenades a bit more of a threat.
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increase the size of the AOE of his stun but have a drop off on how severe it’s affect is to compensate. There have been a few times where I’ve been able to see an enemy Thunder’s concussion grenade go of but not be affected by it in any way. I think that unless you are a significant distance away, you should be affected by it by some degree if it blows when you’re looking in its direction woth nothing blocking your view of it.