Volatile doesn’t reliably proc when shooting an opponent with the debuff. I would kill a guardian that was above half health and it wouldn’t proc. It doesn’t make sense why hitting an opponent with a melee when their frozen causes them to shatter but doesn’t prock volatile with a melee shouldn’t be a thing. Volatile should work more reliably.
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Volatile does have a few issues take a perk like "repulsor Brace" where killing a void defuffed target grants an overshield, but should the volatile explosion kill the target and not the weapon, you wont get the overshield. collective obligation also has some issues when it comes to leaching volatile rounds too.