Inaccurate?

Halaster's Fetch Iv

(City of Splendors: Waterdeep)

Conjuration (Calling)
Level: Sorcerer 7, Wizard 7,
Components:

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