The Singularity Renown Guide
The Crucible of Erratic Energies trinket is very likely the trinket that a lot of people will have going into Season 1, as it's one of four Champion pieces currently available in the Preseason. This trinket provides a Crit, Leech, and Movement Speed buff with a proc rate of 4 RPPM, meaning that it procs quite often.
Last night, the trinket unfortunately took a nerf to the crit rating provided:
Crucible of Erratic Energies crit rating reduced by 41%, 122 crit rating at iLvl 246 (was 208).
