A flux construct is any animated construct or organism made from faux matter. A variety of different abilities can be formulated using faux constructs, and they can even be the source of certain other psionic abilities. Constructs can be animated using metamanipulation, but they can also be given their own minds through the creation of neuroinvasive tulpas as part of the ability.
Constructs can also be made invisible similar to phase matter - in this state, they can only be seen by someone with cuilsight.