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During the 90's (probably 1993 - 1998), a classmate was reading a book that he described as having the following plot (from what he had read so far): A man is either summoned because a group of college kids summon a demon using a ritual, or because he was the creature that was summoned. The man then is described as murdering the kids, with one passage describing him as (the classmate read the passage to me, and it roughly followed this paraphrase) pounding one of the kids' heads against the ground repeatedly until there is a soft, wet sound instead of a hard thud.
I know this isn't terribly too much to go on, but perhaps it's unique enough that it will stir someone's memories. Thanks in advance!