Drethdok, a cyclopean monster that's able to breathe fire and heal himself.
There are remnants of cyclopean walls built by the Samnites, locally called "Civitelle." As the name implies, they were likely part of a small fortress destroyed by the Roman Army in 293 BC; the historian Livy describes the march of two Roman armies, headed by Spurius Carvilius Maximus and Lucius Papirius Cursor, which met at the Civitelle.
The black rivers of pitch that flow under those mysterious cyclopean bridges—things built by some elder race extinct and forgotten before the beings came to Yuggoth from the ultimate voids—ought to be enough to make any man a Dante or Poe if he can keep sane long enough to tell what he has seen...