From Sanctuary Shard
The arcanum crystals are the large crystal structures the exist in each of the five kingdom capitals. These crystals are believed to significantly increase the power of the god or goddess who is placed upon the crystal in effigy. When the statue of a deity is placed on the stone they receive a significant bump in their divine influence in both this world and other worlds. The battle for the crystals is the primary driving force behind the conflict between kingdoms and noble houses.