White Powder in Dallas, Texas

Malagor is building an army of the dead, banished from hell he seeks revenge on heaven, hell and earth for the loss of his mortal family.
The only beings who can stop him are the descendants of the medieval Queen Selena, who are blessed with healing powers yet cursed to age if they use the powers, in death becoming demons answering to Malagor.
They must kill Malagor and break the curse by piercing his heart with metal laced lime dust.
Descendant, Noah Smith and accomplices travel in time to 1963 to collect the lime dust. Once there they are tempted to change history, getting caught up in the events of the assassination of the American President John F Kennedy.
Malagor attacks with his army of fiery demons, tricking the only being who can kill him, Noah, into ageing.
Weak and near death Noah must summons the courage and strength to fight face to face with the evil that is Malagor.