#containment spell

The fifth Grivk is most commonly used to make something bigger on the inside than it appears on the outside. The way you would do that, is to open a small, constant portal inside of the item(Let's use a backpack as an example) which leads into the fifth Grivk.  Besides the portal itself, you would need one Ankeor to keep the portal open, and one Ankeor to maintain a containment spell to keep your possessions from drifting off into the vast empty space in the fifth Grivk.