I'm a little unclear on how the havero tentacles in the Acropolis of the Thrallkeepers are supposed to perceive their targets? The stats give them blindsense, which reads:
"Using nonvisual senses, such as acute smell or hearing, a creature with blindsense notices things it cannot see. The creature usually does not need to make Perception checks to pinpoint the location of a creature within range of its blindsense ability, provided that it has line of effect to that creature. Any opponent the creature cannot see still has total concealment against the creature with blindsense, and the creature still has the normal miss chance when attacking foes that have concealment. Visibility still affects the movement of a creature with blindsense. A creature with blindsense is still denied its Dexterity bonus to Armor Class against attacks from creatures it cannot see."
So, the havero tentacles don't have to roll to perceive a target, but the target is still considered to have total concealment, providing a 50% miss chance to any attacks? Is this how it works?
I don't know about the hardback edition of Curse of the Crimson Throne, but it appears that in the original edition the tentacles have darkvision and a perception score of 5.
I'll check my hardcover edition tonight, but if the developers changed their senses from darkvision to blindsense, it would indicate that the tentacles are intended to be blind and have a 50% miss chance on their attacks.