Answer:
It is where kings, queens, knights and bishops go to war together.
Inside a burning house, this thing is best to make. And best to make it quickly, before the fire's too much to take.
What is at the end of a rainbow?
Humans have two that shrink in the light and expand in the dark
One might hang a locket from this
A mysterious, fantastic creature, It has one defining feature, And for humans at their worst, In their eyes it's just a horse