Answer:
Slayer of regrets, old and new, sought by many, found by few.
What get wet while drying
At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.
Looks like water, but it's heat. Sits on sand, lays on concrete. A play on the eyes, but it's all lies.
Break it and it is better, immediately set and harder to break again.
What covers its face with its hands, speaks no language, yet most known what it's saying?