Answer:
A precious stone, as clear as diamond. Seek it out whilst the sun's near the horizon. Though you can walk on water with its power, Try to keep it, and it'll vanish within an hour.
Someone walked into a room and you heard a crash! Someone died. What happened?
He stands beside the road. In a purple cap at tattered green cloak. Those who touch him, curse him.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.
What an fill a room but takes up no space?
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.