I've been trying again to use graviton Lance. The last time I did the same thing happened to me months ago. The Cosmology explosions do literally 0 damage 99% of the time. They either fly up into the air way above any enemies and do nothing, or blow up literally against other thrall and still does nothing. I've gotten over 700 kills with it on the thrall way and only gotten about 3% of the Cosmology required. This happens everytime I use this gun. It looks like it's spawning the void explosion animation but not the tracking orbs and so it does nothing.