Ancient Summoning Tower

Until a few centuries ago, overworlders were summoned via rituals carried out in towers such as these. However, human-built summoning towers had a low success-rate, and seemed ill-suited to the task; nowadays it is far more common to use elven ruins for this purpose. The people of Aincrad value overworlders for their ability to help out—yet who summoned them in the first place, and why, remains shrouded in mystery.