They'd never allow multiple nava bombs, that would be majorly op, and if they did it would be out the game in a week after all the complaining.
English
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Nova Bomb kills reduce the cooldown of your next nova bomb + increase the super energy from killing minions of the dark + 100% intellect + another Warlock on your team who creates motes for you...cooldown of two warlocks that are decent should be less than 1 minute, just stating the obvious, not judging
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Yh that's all perfectly fine in pve as long as it doesn't happen in pvp