Which is why I said it is in how you roll it and not in the number crunching. From a purely mathematical viewpoint there's no real difference between the numbers for (10d6)/2 and 5d6. Game-wise and rules-wise, i.e., how you roll it, it is important. The rules state you take half the damage, which would be (10d6)/2, and not 5d6, which would require another roll.Felix said:The difference being that if you have 2 PCs targeted by the Fireball, and one saves while the other does not, then the one who saved does not necessarily get hurt less than the one who didn't.