Suppression is good and a strong debuff, but the suppression grenade alone on the subclass is not enough to carry it for hunters and warlocks. Besides the fact that both warlocks and hunters could use at least a second melee ability on their void subclass, a suppression melee would actually be helpful against overload champions.
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Both should get a second melee to match Titans.
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Warlocks are Devour and Weaken Titans are Overshield and Volatile Hunters are Invisibility and Suppression. Hunters are lacking in the suppression department, but the Titans in comparison to the rest of the classes just make everything volatile really easily. Weaken on Warlocks is purely because they spam Grenades, so so much.
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The void hunter melee should be a void dagger slash that passes the opponent.