Void is currently performing quite well as a Reroll comp that is mainly focused on playing Rift Herald, but can also eventually get to Baron Nashor in late game.
In the early game you want to roll for Cho'Gath*3, Malzahar*3 and also collect all of your Void units. You can then push for Level 6 to field 6 Void either with an Emblem on Taliyah or with an early Kai'Sa.
The Star Level of Void units will heavily increase the powerlevel of your Rift Herald. You can Isolate the Herald in the Frontline to maximize the Knockup Potential, which works especially well if you are running Taliyah*3. Your win condition in late game can be a mix of Velkoz/Reksai/Kaisa or simply push for Level 8 to add Baron Nashor with Belveth and Void Emblem.