The Heart of Calrex was an anomaly when it was discovered eons ago.  Today, it is a well researched anomaly.  A beam of aether piercing through the earth and the sky, it is unknown if its beating 'heart' in the middle is the source of the aether, or a meeting point between two others.  What is known is that the ambient mana that it releases into the air allows for wizards and sorcerers to cast spells far beyond their measure.  Spells that normally require constant maintenance can sustain themselves.  The College of Dythir was constructed around The Heart of Calrex, suspended upon the very mana that coalesces around it.  The College serves as the leading source of magical research, but also the hub for military in the Kingdom of Antir.  Peace reigns across the land, as nobody wish to upset the mages of the College.