Summon Derghodaemon

Conjuration (Summoning) [evil]
Level: Cleric */Oracle * 9, Sorcerer */Wizard * 9, Warlock * 9
Components: V, S, F (a handful of bug carapaces)
Casting Time: 1 round
Range: close (25 ft. + 5 ft./2 levels)
Effect: one summoned creature
Duration: 1 round/level (D)
Saving Throw: None
Spell Resistance: no

This spell functions like summon monster, except it summons a single derghodaemon.