Conjurer

A conjurer is a Mage specialized in Conjuration School. Hes focus in summoning and creating things.

Unfortunately this does not exist in DDO, but a way to emulate it if you wish to play such a Mage for Role Playing reasons is to chose a sorcerer and only select conjuration spells. If you were to do that then the following feats and enhancements would be beneficial.

Usefulness of diffrent feats
Quicken Spell could be a livesaver for him if he nead to summon faster.

Benefit of a Sorcerer
A Sorcerer already has faster casting that affects his summoning speed significantly compared to a Wizard.

Usefulness of diffrent attributes
As with all spell casters the caster attribute is most importent (int for Wizard and cha for Sorcerer). For a Conjurer, con (that effect concentration) is the 2nd most important attribute. The reason for this is that summoning takes time. And if you are getting hit in a battle, you need to be able to concentrate so you don't get interrupted before you get your summoned-friend there.

Usefulness of diffrent Sorcerer enhancements
Energy of the Dragonblooded is usefull for every Sorcerer. Skill Tactics is usefull for a conjurer as it raises concentration.