Quote Originally Posted by JNAProductions View Post
Okay. A level X PC is supposed to have a 50/50 chance of soloing a CR X monster, correct?

So let's take, say, a Greater Air Elemental (CR 9). Can you build a Fighter that has a reasonable chance of soloing this guy, without any magic items?
Well, that's not exactly correct. The DMG just says that a CR 9 creature is supposed to be a "good challenge" for a group of 4 9th level characters. So, if "good challenge" is 100% chance of success for you, then a Fighter 9 should have a 25% chance of success, but if "good challenge" is less that 100% chance of success, then that chance of any single character succeeding is going to be lower as well.

The DMG doesn't really outline challenges for individual characters, but for parties.