Secret Omen was created in 1978.
Merkaz Omen was created in 1958.
The Omen was created on 1976-06-06.
Earth Omen was created in 1972.
The Omen Machine was created on 2011-08-16.
Omen - song - was created on 2009-02-16.
Omen - Star Wars novel - was created in 2009.
Omen III - song - was created on 1994-01-14.
The Pious Bird of Good Omen was created in 1967-09.
No, but a good explanation of her secret is the last 2 books in The Power of Three and the first book of Omen of the Stars explain the consequences of the secret.
It Is No Secret was created in 1951.
A Secret was created in 2007.
The Secret Is Out was created in 1995.