Inaccurate?

Halaster's Fetch Iii

(City of Splendors: Waterdeep)

Conjuration (Calling)
Level: Sorcerer 6, Wizard 6,
Components:

As summon monster III, 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.