In my group, we are taking it in turns to DM. We are currently on our 2nd adventure and I am preparing to DM the next one. During my preperations, I have discovered a potential problem.
Our first DM created a house rule for levelling where we add our constitution modifier and half of our level to our HP increase when we level up. At first this wasn't a problem. However, as I have been considering the parties stats in my preperations, I have realised that this will make everyone quite overpowered at later levels.
For example, one character only had a Con modifier of 1 at heroic tier and is not going to actively upgrade it. He gains 5 hp each level for his class and he took the "Toughness" feat to try and counteract his low Con score. Now, according to my calculations, at level 30 he will have 473 hp! (I calculated to level 30 so as to see his max hp)
Is this as unbalanced as it seems? If so, how can I/we rectify it at this stage in our character's lifespans?