Summon Undead 4

Conjuration (Summoning) [Evil]
Level: Blackguard 4, cleric 4, dread necromancer 4, sorcerer/wizard 4
Components: V, S
Casting Time: 1 round
Range: Close (25 ft. + 5 ft./2 levels)
Effect: One summoned creature
Duration: 1 round/level
Saving Throw: None
Spell Resistance: No

This spell summons one zombie wyvern. Summoned undead do not count toward the total Hit Dice of undead that you can control with animate dead, plague of undead, or other command undead abilities. No undead creature you summon can have more Hit Dice than your caster level +1.