Making a large build requires lots of blocks, and having to keep moving stacks of blocks back into your hotbar can be a hassle.
The Inventory Assist perk simplifies inventory management, and automatically will refill inventory slots with the same items as they as the stack is consumed. This will take other stacks of the items from your inventory, allowing for large amounts of blocks to be placed without worrying much of inventory space.
If you also have the Shulker Assist perk, items will additionally be taken from the contents of shulker boxes within your inventory as well.
Note that this perk is already included in the Seraph rank.
