My hardest decision was when we were fighting mages and Lydia died. I could have reloaded the game and had things back to the way they were before, but instead I decided to trek through it, and make it a reason why my character decided to go through the path of necromancy. It ended up making that character a level 67 (don't really remember, but that's the last screenshot I have) master necromancer, with an undead Lydia by his side.