Yes. Because I want for THAT specific monster, for ITS specific fight, people calculate well what and how to do. I didn't give it as an ability that can be select any Sidereals or Eternals. Besides, I only remove the automatic revives. A First One can safely resurrect a slain creature. A strategy to overcome is precisely to leave one of the First One party outside the Dead Magic area and ready to use Alter Reality to resurrect a dead ally.Moreover I find it ironic that you are complaining about catch all powers when, isn't that exactly what you just gave this thing? An unstoppable power that instantly negates all enemies Cosmic strings and all forms of revivification with absolutely no way to counter it?