Collect all Voidrunner StashesIn total, there are 28 Voidrunner Stashes (or Void Logs) that you need to find and interact with. Unlike the Journal Pages for There and Back Again , these will be a little easier to find as they have a blue light shooting out from the top of them, making them visible from pretty far away. There is 1 in the Crater, 5 in the Broken Capital, 5 in Ironroot Basin, 5 in the Eternal Garden, 6 in Mirrorsea, and 6 in The Luminous Peak. You can get these as you go or collect them after you've completed the story. All 28 are required for Rei-gn Supreme and after collecting all 28, you will also have unlocked all of the suits.
If you prefer to use a text guide for these, PowerPyx has provided a well written collectible guide that includes text and images that you can use here.
If you prefer to use a video guide for these, please reference the one below for all 28 locations.