"Harry Potter" author J.K. Rowling finished writing another book, a set of children’s stories entitled "The Tales of Beedle the Bard," which are mentioned in the seventh novel, "Harry Potter and Deathly Hallows."

Since wrapping up the final Harry Potter book, the British author took no time off, in fact she has been working on a new book, a collection of wizarding fairy-tales which she handwrote and illustrated herself.

The book was a "wonderful way" to say goodbye to Harry Potter, whose story took Rowling seventeen years to complete.

"I was literally writing out - as these are handwritten books - these new stories which has been a wonderful way to say goodbye. It's like coming up from a deep dive."

"People kept saying to me 'you'll be glad to have a break from writing', when of course I wasn't taking a break at all," added the writer.

Only seven copies of "The Tales of Beedle the Bard," have been printed and bound in brown morocco leather mounted with silver and semi-precious tones, to enhance their rarity. One copy is set to be auctioned off next month with the money going to charity, while the others will be given away as gifts to people who are "most closely connected to the Harry Potter books over the past 17 years," Rowling said on Thursday.

In "Harry Potter and the Deathly Hallows," the collection of fairy-tales represents a very important key to the book’s plot, being left in his will by Hogwarts School of Witchcraft and Wizardry headmaster, Albus Dumbledore, to Hermione Granger, one of Harry’s best friends.

Auctioneers Sotheby's believe the copy being put on sale could go for up to $100,000. The buyer will not be given any copyright and reproduction will be prohibited.

Although Rowling said she won’t be writing further Harry Potter novels in the near future, she is still planning on penning a Harry Potter encyclopedia based on notes which weren’t included in the seven books. Most recently, the author filed a lawsuit in which she accused the publisher of an upcoming reference book on the boy wizard series of infringing her intellectual property rights.

Written by a librarian, Steve Vander Ark, who conceived an online encyclopedia about Harry’s adventurous life, the book is due out in the UK next month.

"It's common knowledge that I love genuine Harry Potter fan sites, which is why I created my own award to recognize their creativity and ingenuity," Rowling said.

"It's also old news that I hope one day to write the definitive Harry Potter encyclopedia, which will include all the material that never made it into the novels, and that I will give the royalties from this book to charity.

"I cannot, therefore, approve of 'companion books' or encyclopedias that seek to pre-empt my definitive Potter reference book for their authors' own personal gain. The losers in such a situation would be the charities that I hope, eventually, to benefit," the writer explained.