What does "Essence Conversion" do? I couldn't see any effect.
Is it for essence-to-buff or progress-to-essence?
It increases conversion rate from power -> essence at the end of the run.
"Essence Conversion" seems to extremely underwhelming, given how fast power -> essence rate decays/diminishes.
Since essense -> buff is already diminishing, essence gain should be run-to-run flat. There is no point to stack diminishing costs.