False. Scarabs that die because of their own 'swarm' passive skill die for the same reason that Vampires die to the destruction of Eclipse after a Firestorm - they have 0 hp. When Eclipse is played, it does not "heal" all Death and Darkness creatures. It simply buffs them +2|+1. When it is destroyed, that buff is removed. Again, the Vampires are not "attacked" or "damaged", but their buff is removed, and a check is made on their Current HP (this check is made constantly in almost all situations, with Spark as the lone exception). If the creature's Current HP is zero or less, then the creature dies. That is why Scarabs die to their 'swarm' passive skill.