Icelandic folktales and legends

This book is for those who might have read my story Witch, cat and a summer vacation and might need a little more information on the characters.
Most of the characters in that story are based on common an known folktales and legends, like trolls and elves.
In this guide to my previous work I will explain the origin of the mane creatures that appear in my story Witch, cat and a summer vacation.
I will however only publish stories of the creatures who have appeared in the story so far so I won't spoil the ending.