I played a Nimblewright once. The DM decided i was wrong when i pointed to the page where it said that a threat for a critical hit isn't an automatic hit unless it is a 20 or it would normally hit. So i decided to make someone who threatened a lot on the monsters with impossible armor class that they like to make.
Now back on to the topic at hand.
-By about level 12 most everything is immune to some kind of energy and most are resistant to several.
-By around level 15 or sooner if you actually try. You have something that lets you ignore a creatures immunity to your attack.
These 2 lead to the 3rd grade argument of anything proof armor and anything piercing bullets when playing cops and robbers.
- (DM dependant) Breaking and entering along with murder are perfectly fine as long as you call yourself an adventurer. This apparently is also quantifiable based on how ugly you are. Party of humans and elves sacking an orc village, adventurers. Party of goblins attacking a human town, raiding party that needs to be stopped and followed back to their homes where you slaughter everything.
- Any book printed by WotC must include at least 1 thing that is so insanely broken that it couldn't have been put in on accident, while
most every thing else in the book is such crap that you only bought the book for said item.