Imagination.
This is one of the things I love most about all creative activities I’ve been involved in.
And writing is without a doubt one of the most imaginative pursuits available to us – anything is possible, and as a writer we’re limited only by our own imagination!
In my experience that is true of almost all genres of writing – but fantasy novels and short stories often are crafted from pure creativity – with incredibly varied and rich lore, fantastic ideas, and language used.