It's an exotic heavy that if properly buffed could have potential. Why hasn't it been brought up to par with other heavy weapons? It's just collecting dust in most players vaults.
Leviathans Breath should be a dps beast in my opinion.
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Not every heavy needs to be a boss dps weapon, I think that leviathan’s breath should instead be the heavy hitting champion destroyer weapon. One idea would be allowing the use of different anti-champion arrows. Kinda similar to how you can slot different buffs in aeons, you could slot different arrows before an activity for different champions.