Constructs are constructions of power, putting together various known Powers in new ways, allowing said powers to be used across Shadow more easily, even by those without the skills usually needed to use them. The art of Construct creation was little-known to most of the Royal Family of Amber before the Annadil Crisis, especially the design of freewilled sapient ones. However, this changed as the Crisis progressed, and several were built or converted to the cause of Amber, and are now regarded as members of the royal family (either willingly or unwillingly).

Unfortunately, it appears that not only the good guys have constructs, and many seem to be in the service of the Outsiders...

At the time of Unicorn no Seishi, the following Constructs are known to exist:

The Good Guys

Questionable

The Bad Guys

As of the Herald Crisis, all the Black Heart Prophesy Constructs have been destroyed. Of course, you never can fully tell, with Constructs...