As is, it's got buff after buff, and it still isn't worth using over cataclysm Nova. Every other subclass had their multiple versions of their supers removed and introduced new ones. So what should happen is remove vortex nova bomb and repalce with with Warlocks very First Melee Based super a Scythe! Introduce a new exotic that collapses nova bomb and its seekers into lance! Similar to how Celestial collapses, its golden gun shots into one.
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Instead of a buff let's rework it. Give it the fast animation and straight trajectory of Lance, split into three, all-at-once Bombs like Shatter and impacts would make three smaller Vortex's that would have the ability to draw in nearby targets. What, too much? Hardly. This is what is needed to make this good.