The prompt should go from the player. Often when there is a mystery, there will be someone weird in the wilds who knows more and could be bargained with. Describe vaguely the entity you search. You can call the entity by its responsibility. Examples:
- I want to search for the spirit that guards the forest in the north.
- I want to find who is responsible for our fishing nets being empty.
- Somebody is keeping the score for all of the evil a man does. We need to talk to them to let us peek into the book
Based on the prompt, GM has a final say, if such entity exists, if so, they create it colaboratively:
- What have you heard about the entity? Tell the name you heard, and give a vague description. How powerful are they? How many are them? What boon or answer would you expect? Player that made the prompt answers.
- What makes them alien and/or terrible? Why humans of the city don’t want deal with them? Players that didn’t make the prompt answer.
- Why would they consort with humans, what do humans have to offer them? Is there a cost to interaction? GM answers
If players decide to pursue the entity, GM should note, at their discretion
- The scale and tier of the entity
- A clock for a goal that reflects their alien nature or trouble they are bout to cause
- A clock for a goal that reflects their reason for dealing with humans
- Where or how can the entity be found?
Based on how hard are they to find, and either gives a straight answer, or gives the first step in the quest to locating it.