Halaster's Fetch I

(City of Splendors: Waterdeep, p. 153)

Conjuration (Calling) [see text for summon monster I]
Level: Sorcerer 4, Wizard 4,
Components: V, S, AF, DF,
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

As summon monster I, except called creatures do not disappear at the end of the spell's duration. They do, however, become free-willed and outside the control of the caller after the spell expires.