Adventure Title
Night/Midnight/Shadow/Darkness of (the) Circle/Ring/Obelisk/Column

Alternate title
Demon/Devil/Fiend/Horror of the Cave/Cavern

Opening Scene
A sewer system that is Barren where they encounter Royalty that is/are Suspicious

Plot hook and draw
A kidnapped relative that is/has Performed a dangerous ritual

Plot Concept
Gather information to prove the existence of something or someone that is motivated by Being manipulated by someone or something

Primary Antagonist
A nefarious cult who/that is Tortured

Plot fulfillment and location
A specific location from A sunken ship