Neztem Petroglyphs

The Netzem Petroglyphs were found on what is believed to be a natural pillar far out in the deserts of Aranoch. They were discovered by Deckard Cain and Leah. Upon staring at the rock, Leah began having visions of a most violent nature, and Cain had to confine her to the tent for the rest of their time there. He later used some of what she said to inform his descriptions of Hell when writing on the subject.

Trivia

 * "Neztem" is a reversal of Chris Vincent Metzen's surname.