Total cheese fest by Richards, the only horror novel by him I believe, and first published by Zebra in 1982. For some reason, this is set in 1970 and starts off in Africa. Some English and American archeologists stumbled across an ancient temple to the 'spider god' or something that has been abandoned for thousands of years. References to the 'spider god' appeared in several ancient civilizations, but this temple seems to be the oldest.
Our main protagonist, journalist Chris Collin, is also in Africa when the temple is discovered, working on the illicit ivory trade. Chris is stuck in some tiny village in Zaire waiting for the rest of his party to return; they were due days ago. When he wants to go after them, the local 'Ranger' takes him to an even smaller village and he learns the lore of the spider god. It seems the 'god', also called 'Anansi' can read your mind and directly possess you if it so desires and you come in range. Hence, a good chuck of the rain forest is off-limits. Unfortunately, that is where Chris' party went...
Well, long story short, but the spider god gets out and heads to the USA and the gist of the story is Chris and friends trying to track it down and kill it. This is one of those novels that is really so bad it is almost good. If you can ignore the gaping plot holes and clichés, The Unblessed becomes entertaining in a strange, 80s horror way. The problem with tracking down Anansi is that he can read you mind from afar and knows what you are up to! Chris, however, is the latest incarnation of some avenging angel or something and he has fought the creature before; in fact, many times in prior lives. What is special about Chris (besides being a reincarnated angel) is that the 'demon' cannot read his mind!
Richards never really describes the spider god in any length, except that is gives off colors and assumes many forms (energy being?). It also likes to suck people's brains out through their eye sockets. Oh, it also has an assistant, the so-called 'guardian', who starts the novel as a devil worshiper in Denver but somehow transforms into the age old guardian after a ritual. I found this curiously compelling, but I did have to start it a few times. If you have a high tolerance for cheese, give this a go, but do go in with low expectations! 2.5 spider stars!
P.S. Still not sure where the spider god moniker came from, as the entity does not look like a spider; maybe because it lures people into its lair (which always seems to be an underground grotto...