This only works if resistances are balanced to be in line so people aren't immune to everything. Even otherworld can be resisted now, although I hear they made a new unresistable damtype... (how long until we can resist this one, huh?). Overall, it's a so-so idea. We don't need easier experience, legendary lessons runes makes legendary levelling loads easier. Reputation grinding is just something extra to do at 200, there's no need to make it even easier (granted it's time consuming, but that's part of the point). Any dungeon you make like this will in the end be negated by the fact that everyone is immune to the area, the damage is so absurd that people can't survive it, or it's so low that healshield negates it. And as is, most people have to walk back to the party leader because most of us -can't- gate as is.