Prosper is an Inventionperk that gives a chance to obtain clue scrolls while skilling. It can be created in tool gizmos. The chance of obtaining a clue scroll differs depending on the skill that you train.
In addition, the Prosper has a 1% chance of upgrading a sealed elite clue to a sealed master clue. Used on a tool at level 20, the effective chance becomes 1.1%.
When the perk triggers, it prompts the message: Your Prosper perk allows you to find a new treasure trail!
Unlike random skilling, Prosper will allow you to gain clue scrolls over the 25 soft-cap limit.
^Mod Ryan. Prosper Perk. reddit.com. 6 February 2017. "It sounds like luck isn't in your favour. The rates aren't that high, but they do differ depending on the skill that you train. It's worth noting that your chances are not increased if you already own any clue scrolls. As an example, if it tries to give you an easy clue but you already own own then it'll stop there."*