Sublime

Any quest, mission, or “treasure locked in a castle” that is to be approached by an individual or a group falls into the Golden Fleece category

A player's ability to complete their quest is a function of the quest and their own skills, resources, and powers. Quests that are easy for certain players are nearly impossible for others: Olympic runners will regularly run sub-5 minute miles during training, even though this would be an incredibly ambitious goal for most people.