This is just kind of a test run, and I know it's short notice, but I was bored.
So, here are the details.
Start: The castle of the king mentioned in the clue.
Reward: 100k gp
Under the rule of King Roald
Where gnomes once flew
A circle gets the square
Only the elite will find access
Extra hint: a spade might help...
Feedback would be appreciated, I will probably end up doing more of these.