So ive been playing with a group all starting level 3 and are about 5 now. When we went into combat everything targeted me, as i was okay with this having 24ac and 55 hp I suddenly after the first attack was brought down to 15 hp. When i asked to see dice rolls for combat attacks from then on because if that was anybody else they would have died right there and it just so happened to be the one who had high health. I was responded with our gm laughing and saying "No, the gm hides everything even attack rolls"