Quote Originally Posted by TwylyghT View Post
That's the whole text as it appears in the PHB. There again is not a most, or usually in the text. its simply "A spell or special ability that instantly slays the target". Nothing in the entry states that the [Death] tag is the sole factor in determining this trait.
It's not that simple, raise dead and reincarnate does not work on a victim of a death attack, and since you can use reincarnate to bring a victim of implosion back to life, implosion is not a death attack.

Death attack: A spell or special ability that instantly slays the target, such as finger of death. Neither raise dead nor reincarnation can grant life to a creature slain by a death attack, though resurrection and more powerful effects can.