You're right, what I'm thinking of is god-tier characters. They are not omnipotent however they are extremely powerful, we should focus on limiting these characters. I would love to have Eris wipe the excessive ones out but Eris can't do it alone and I'm sure most every one thinks their godly character isn't excessive (I am no exception), We have discussed the idea of separating gods from mortals but we never put it into place. If we create such a dimension I feel like it should have what I call the Superman effect. Superman is only super because earth has a yellow sun, on his home planet however he is much less powerful because of the red sun (and the heightened gravity among other things). The dimensions would work similarly, the god dimension would render gods to super powered humans while they still retain their powers in the other dimensions. Travel would still be available however the gods would not be able to create their own portals as they do not have the power to do so.

It still needs ironing out, that is if any of this makes any sense.