http://skyrim.nexusmods.com/mods/40999/

The depths of Breezehome are walked by the undead and haunted by spirits. In order to cleanse Breezehome, you must delve into the dark past of the previous owner, and his family's legacy.

Adds 7 new conjuration spells, including:

4 summonable undead creatures (Apprentice, Adept, and 2 Expert)
3 new direct-damage conjuration spells

Also adds a new staff with unique spell visuals, as well as expanding the home of Breezehome.