So many people think that if you're writing fantasy, it means you can just make everything up as you go. Want to add a dragon? Add a dragon! Want some magic? Throw it in. But the thing is, regardless of whether you're dealing with realism or fantasy, every world has rules. Make sure to establish a natural order.
Sentiment: POSITIVE
I'm going to get hated for saying this, but honestly, fantasy is easy to write because you can do anything. It's like when Raymond Chandler brings in a bloke with a gun when he's stuck - in fantasy, up pops a wizard, and off we go.