Here are some examples of how to use it in a sentence:
* The questing knight rode through the forest.
* Her questing spirit led her to explore new lands.
* The book tells a story of a questing hero.
You could also use quested as an adjective, but it's more commonly used as the past participle of the verb "to quest."
For example:
* The quested artifact was finally found.
* The quested treasure was lost for centuries.