You could always do the void sword quest on your titan like I did. Now THAT is a grind!
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Doing it at the moment, monte carlo and armamentarium make it pretty easy.
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Cheerz handy
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I shot vex's heads off about three of them, then get them real close to me (as they would run up to you), and throw a grenade at the ground. Depending on where you lead them, you could get 3-5 with one grenade explosion. Plus they spawn in a cluster at the Scablands.