There are a number of dead gods, demons and other creatures long forgotten who’s planes of existence have ceased to exist and who now float around the astral, petrified with old age and lack of followers.
While most are just ignored, or used as the occasional stopping place or landmark in the infinite phlogiston, the Githyanki are famous for using them as bases of operations, cities, fortresses and so on.
At some point this structure was the head of something large and unpleasant. And at some later time, that head was broken off from the rest of the body and then slowly retrofitted into a small fortress.
Or, if you really want to go weird, get rid of the whole astral plane stuff, and this head fortress floats timelessly 333 feet above the surface of the world, travelling where it is commanded from the spires level of…
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