Noticing that not all of my kills with Graviton Lance are activating Cosmology, or the detonations are so delayed that all nearby enemies have moved out of range. Making it real hard to work on the catalyst.
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Its a long catalyst to complete, try running a thrall heavy area, and you will eventually get the kills. The thrall rooms in Shattered Throne is a good one, and the beginning of Grasp of Avrice where they spawn from the loot cave. My only suggestion is to kill slowly, once the detonations start, they can potentially keep chaining more kills! Good Luck!