From the publishers blurb:
Three temples for the Ancient Ones is a three part campaign for OSR and fantasy games in general, in which players are guided to three different locations in search for ancient and forgotten tools.
The first of the three temples is the Inverted Pyramid, a dungeon located in Thebes, Egypt. The place was built as a gigantic tomb to hide secrets and technologies from the Ancient race who had enslaved humanity millenia ago. In this adventure booklet you will find:
Tables of random Traps
New magic Items