Answer:
I am a box that holds keys without locks, yet they can unlock your soul.
What kind of pet always stays on the floor?
I build up castles. I tear down mountains. I make some men blind. I help others to see.
My first is twice in apple but not once in tart. My second is in liver but not in heart. My third is in giant and also in ghost. Whole Iām best when I am roast.
I follow the orders of only two. I respect the work of only two. I am in constant battles with many, Though one surpassed them all. With forces joined, We created hell, Until our mutual enemy fell. Who am I?
Dry though I may be, I am still a sea.