During your journey you will encounter 4 wisps which will provide you with a magic item if you answer their questions correctly.
This wisp has lost its name and claims you stole it. You have 3 options which will give you different rewards:
Name it Hearthfire Edit
You can either say "I didn't take your name" and let Lady Katerina name the wisp, or say "Begone, evil spirit" and name it Hearthfire yourself.
Name it Lifespark Edit
If you say "Begone, evil spirit" you will also have the option to name it Lifespark.
Other Options Edit
If you choose any other option the wisp will attack you dropping random items on his death.
Riddlewisp in Dreadworks Edit
This wisp will ask you the following riddle: "It begins but has no end... yet it ends all that begins."
Riddlewisp in The Old Town Edit
This wisp will ask you the following riddle: "What is the answer to Life, the Universe, and Everything?"
Wisphunter's Guide to the Ink (+5 Willpower)
Riddlewisp in The Pocket Realm Edit
This wisp will ask you the following riddle: "I touch the earth, I touch the sky. If I touch you, you'll surely die!"