Summon Cacodaemon

Conjuration (Summoning) [evil]
Level: Artificer * 2, Cleric */Oracle * 2, Sorcerer */Wizard * 2, Summoner * 2, Warlock * 2
Components: V, S, F (a silver hook)
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 cacodaemon.