Zarathul is the deranged alter ego of a quiet, unassuming man named Andrew Hunter who fractured his psyche in a forbidden attempt to channel the spirits of H.P. Lovecraft and C.S. Lewis. The resultant explosion tore apart the fabric of space and time, summoning into this world the rat-infested hulk of the H.M.S. Lewcroft, which had gone missing off the coast of Bermuda in April of 1952, as well as the mad ghost of an 18th Century privateer calling himself Zarathul the Undying. Upon his return to this world, Zarathul soon evicted the rats and sold the Lewcroft as scrap iron. Unfortunately, he lost most of the profit in some rather unsound investment schemes in the early 90's, and he now resides with Mister Hunter and earns a meager living by creating art and literature of a questionable nature while pursuing his hobbies of treasure appreciation and scowling.
The rats fared much better, having invested their share of the scrap metal proceeds in tech stocks, and they are now living comfortably in Bermuda and curating a popular design blog.