As long as the person with the power of the will used it to drive the magic circle on the portal ball, the magic circle will draw out the mana from the magic gem and convert it into the energy similar to mana, so that the items inside could be taken out. It was a very clever idea. Using the commander's power of the will could use portal items.
Abel used the power of the will to open the portal ball. In a cubic space, there were two sets of dwarven magic armor and weapons, one spell scroll, a delicate circle board, daily necessities, and ores.
There were even two pieces of wind silver, two small pieces of iron meteorite, a large piece of iron ore, and a dozen magic gems that might have been used to supplement the energy of the portal ball and activate the circle.