This guide will let you know how to make Void Bag and Void Vault in Terraria 1.4.
Following is the recipe of void bag and void vault; you need to craft both to make it work.
Recipe of Void Bag:
Recipe of Void Vault:
You only need these three items and craft them on the demon altar/ crimson.
How it works:
If the player picks up the item with full inventory, then the items are placed in the void vault, indicated by the purple pickup text.
You can also access the void vault by using the void bag.