Summon Undead IV(Libris Mortis: The Book of Undead)
Conjuration (Summoning) [Evil]
Level: Blackguard 4, Cleric 4, Sorcerer 4, Wizard 4,
Effect: One or more summoned creatures, no two of which can be more than 30 ft. apart
This spell functions like summon undead I, except that you can summon one undead from the 4th-level list, two undead of the same kind from the 3rd-level list, or four undead of the same kind from a lower-level list.