Arelith

Description
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Pit Fiend General (Grade 6 Warlock/Blackguard Summon - not the GATE LE Summon) is listed as having Improved invisibility on cooldown (http://wiki.nwnarelith.com/Summons) however I have never witnessed it cast this in over 50 summons.

This has been tested on warlock; presumed to be the same summon, so same on BG

Steps to reproduce
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Cast Summon Creature 6 as warlock
Enter Combat
Pit Fiend Activates lesser aura of fear
Pit fiend then engages in combat

Expected result
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Pit Fiend General's 1st / 2nd action in combat (Before or after lesser aura of fear) should be Improved Invisibility.

Actual result
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Pit fiend General does not cast this spell and moves to engage in combat instead.

I think it was intentionally removed because it broke the pit fiends action queue and left it standing around doing nothing for 5-ish rounds in combat.