@LeeRoy Alright, I think I see where you're coming from, and I honestly do agree with your opinion. I understand that in order to make a story more dramatic there does have to be some sort of stakes, a give and take. If the villain isn't threatening something, then it's not doing its job. Things need to be threatened and damage needs to be done, there is no motivation for a hero if the villain isn't going to try and either hurt the hero themselves or the people close to them. That's fine, I do agree with that. And for the record, I have caused damage with my villains, the NPCs killed did mean something to those characters. Umbraxis killed cops, fueling the rage of both Thunderbolt and Boom, and The Shroud Syndicate killed Lyger's best fried(unintentionally, but that's still a driving point). It may not be what you had in mind, but that's still hurting them.
However, I'm simply pointing out this is a collaborative effort, and I'm not looking to end anyone else's fun because I need to make my character more intimidating. Sure, NPCs only matter in universe, but that's still important motivation for the heroes. Even your recommended villain Ozymandias(who I would agree is more interesting than Galactus) had a grand scheme that killed a bunch of supporting characters nobody cared about instead of the actual characters, with the Comedian being the obvious exception(Rorschach was killed by Dr. Manhattan and was not part of Ozymandias' plan). It is not the act that causes the rise, it is the reactions from the other characters that brings the weight, NPC or otherwise. This isn't a single person's story, everyone has something important they want their character to do, and I respect the interest of a person to try and keep them in mind when I want to attack or permanently injure their character. Sure, throwing someone like Eva against someone like Nightmare alone will more than likely result in Eva's death, but it should at least be conversed between the two players to make that event meaningful.
Impact is very as important as you said, and if I were writing the story on my own, many existing characters would die. But I'm not writing it alone this is a collaboration, and I'd rather see everyone's characters serve their purpose rather than become fodder because I need them to. If I want to hurt someone's character, I'll talk to them about it. I'm not looking to upset the players, just the balance in game. A dramatic act like killing or hurting another player's character only works if everyone's on board, otherwise what is the point of collaboration? Judge my characters as you wish, but I do think I've made efforts to cause dramatic tension among the game and not its players. Saying things like 'I guarantee the death of three heroes' implies taking the story in your own direction, not collaborating with someone to see if their character's death could fuel a good plot point in the future.
I'm not disagreeing with you on the idea of hero/villain dynamic at all, you're absolutely right. I just want to do it respectfully, and we admittedly have differing views on what hurts a PC.
And
@Dedonus You were right with Umbraxis not using his full power, his avatar form was what touched down on Earth.