Dayton mass killer Connor Betts kept a chilling journal of demented scribbling and Satanic drawings — and even spoke of “hunting” someone from the University of Dayton, according to a new report.

“Seek and destroy,” Betts wrote. “…very ADHD, paranoid, schizophrenic, strong, bipolar.”

In page after page of disjointed scribbling and odd sketches, Betts rants about drugs, violence and women — referring to them as “b****es” — and even about being dissatisfied by his own appearance, according to the Daily Mail.

The pages include drawings of skeletons and the Grim Reaper, and one has a pentagram with the words “hail Satan” written alongside it.

“I am Azrael and this is my human Connor,” one entry reads. “This human body has so many stupid limits lol. Why? Makes me look less than ‘average.'”

The chilling pages were given to The Mail by friends of the 24-year-old gunman in Sunday’s mass shooting that left nine people dead — including his own sister.

Former friend Ian Himes said Betts was “very consistent with the methamphetamine,” and was “pretty much smoking it every day when we were hanging out.”

He said Betts “definitely thought Donald Trump was a dumb guy,” but “didn’t like Hillary Clinton either.”

Stories of the mass shooter’s dark and disturbing behavior have surfaced since he was gunned down by police after opening fire in the trendy Oregon District in Dayton — including choking his sister’s middle school friend and socializing with his sister less than an hour before killing her.

“Ultimately Connor slipped through the cracks,” Himes told the Mail. “Maybe the notebooks hinted at what he was about to do, but you just cannot anticipate a person doing this.”

“Whatever was inside him, he just finally let it take hold of him,” he said. “He lost the struggle with himself.”