Thunder is a dark brown horse with scars of battle all over his body, he was found just outside New York bleeding and dying and they cured him. However, nobody likes him except for Zero. They have a mutual understanding and they tolerate, and respect each other as warriors.
He has a dark brown coat, green eyes, large scars up and down his body, an indomitable spirit, and a strong bond of Loyalty
His owner is Zero
Camp Half-Blood: A New Adventure
So... you're a Demi-God eh? No place safer than Camp Half-Blood.
