Inspired by the summoner class of Final Fantasy. The build uses most of the long casting and powerful spells of DkS. I think from is teasing us with Pursuers as a new summons school of magic. The principle is pretty basic: high Att slot cost, low # of castings, long casting time and a image of a thing (dragon, demon, etc.). The summoner is more of a defensive type of mage, thus Great Heal.
http://mugenmonkey.com/darksouls/?c=226938452692675692
http://mugenmonkey.com/darksouls/?c=226938452692675692