Adventure Title
Jewel/Gem/Amulet of (the) Circle/Ring/Obelisk/Column

Alternate title
Ghost/Spirit/Specter of the Cave/Cavern

Opening Scene
An execution chamber that is Chaotic where they encounter Clergy that is/are Suspicious

Plot hook and draw
An anonymous letter that is/has Delivered sensitive information

Plot Concept
Tear a gateway to an ancient era that is motivated by Being manipulated by someone or something

Primary Antagonist
An evil priest or priestess who/that is Intolerant

Plot fulfillment and location
Subjects for experimentation from An otherworldly entitys lair Ancient or Otherworldly