Lu-Kthu, also known as Lew-Kthew or The Birth-womb of the Great Old Ones, is an Outer God which features in the H.P. Lovecraft-inspired Cthulhu Mythos.


Appearing as a colossal conglomeration of innards the size of a large planetary body, on closer inspection Lu-Kthu can be seen to possess a slimy "skin" covered in countless thousands of what at first glance appear to be warts but which are in fact biological incubators, each one containing a Great Old One in its larval stage. It's whole interior is also riddled with enormous tunnels which are home to yet more of these disgusting pustules, housing an untold number of unborn monstrosities. It is currently unknown how often these entities reach maturity, but given the power and malevolence of a single Great Old One, it must be hoped that this is not a regular occurrence.


  • Lu-Kthu made its only appearance in James Ambuehl's short story Correlated Contents (1998).