@Ollumhammersong it's not like that at all. You don't sound like you've read Thousand Sons the novel. It would give you more of an accurate impression.
Also, I count surviving the plasma blast as a very lucky and unique event. It was difficult, and I described it as such.
One might say your use of a plasma weapon to one-shot a character is equally as OP as any sorcery spell. What is the difference? Why do you get that ability and I can do nothing about it? Why not vice versa even a little bit? But look, I'm not complaining, because I trust you as a player. So just calm down.