"Thrallherds send out a resonating psychic call, a call that urges those who may be actively or subconsciously seeking someone to guide them, control them, or lead them to come to the thrallherd. These followers of the thrallherd are completely loyal fanatics who will follow the thrallherd’s instructions completely. As a result, thrallherds tend to have large retinues that can either stay close to the thrallherd, go out and perform varied tasks, or even stay behind and manage the thrallherd’s residence."
"A thrallherd who has just entered the class sends out a subtle psychic call for servants, and that call is answered. Essentially, the character gains something akin to the Leadership feat, but with some important differences. Those who answer a thrallherd’s call are not referred to as cohorts and followers, but rather as thralls and believers, respectively. They do not appear because they admire the character and want to serve her, but because a hidden psychic resonance connects the thrallherd and her servants."
I'd say that they are capable of higher level critical thinking, they are just mentally enslaved. The way I'm styling my character is that it's sort of a hive-mind.
Edit: But the Legendary Captain is going to act as helmsman/navigator, right? Also, who's on Team Evil? Its hard to keep track.