Only during Scarlet Spear. They had Splintyx, a ramsled, and a pair of ships. One was a standard fighter, and another had some cool tricks: it would make four clones of itself, and only the real one took damage.
if you were boarded by these “Anu” units, they would be deadly, like normal Sentients. I forget which, but one of the standard Sentients would deploy anu vomvalysts that blocked your guns, forward artillery, and even engineering until destroyed.
but now since scarlet spear is over, Anu units can no longer be found, not even in codex, despite me scanning them ple