Answer:
Humans have two that shrink in the light and expand in the dark
War fought with pieces on a board.
I'm the son of water but when I return to water I die. Who am I?
I start in little but I end in full, you'll find me in half and complete.
Touch this and you'll regret it. But if it's cold, you won't forget it. What is it?
I am a room that has a roof but no walls. What am I?