Chrysalis of Eternity (just called Chrysalis) is a Cosmic power-up that helps you farm crystals using Crystal Cavern, but does little else.
While you have Chrysalis equipped, all of your Crystal Cavern procs are doubled; meaning if you have a gun with two Crystal Cavern talents and Chrysalis equipped, every body you identify gives you four chances at a crystal, instead of two.
There's a google sheet with the chances of this but in case it gets taken down here's a hard picture of the chart: