One last feat to catch up on the blog. Something I think is a long time coming for Pathfinder.
You are a master of the dark arts. Those who you summon are much stronger than average.
Prerequisite: Spell Focus(necromancy)
For purposes of determine hit points of any undead that are created by you, increase the charisma modifier by the attribute modifier of your spell casting attribute. As an example, a wizard with intelligence 18, would add +4 hp per HD to any undead created.