Difficult and Rewarding Raids

When a raid activates, even if you die, it saves your progress. So essentially, you can just die over and over till it's completed, there is no failing it. I think the raid should start over if you die, making you do it in one life. It doesn't feel right to just die and comeback. Also, maybe there should be more of a penalty to the raid the more you die. Maybe if you finish it in your first attempt then the deals you get from trades have better prices and items, and it progressively gets worse based on the amount of times you died