Upper_Krust
Legend
Hey there! 
The official CRs you mean.
There are two dichotomies in D&D that reverse from low to high level.
At low level, AC > Attack Bonus, but Hp are proportionally low compared to Damage.
Whereas at high level, AC (roughly) = Attack Bonus, but Hp can soak up multiple attacks.
At epic level, AC < Attack Bonus, and Hp can soak up even more attacks.

boredgremlin said:Well CR's break down in higher levels.
The official CRs you mean.

boredgremlin said:Enemy HP and defensive measures dont keep pace with damage dealing potential at high levels.
There are two dichotomies in D&D that reverse from low to high level.
At low level, AC > Attack Bonus, but Hp are proportionally low compared to Damage.
Whereas at high level, AC (roughly) = Attack Bonus, but Hp can soak up multiple attacks.
At epic level, AC < Attack Bonus, and Hp can soak up even more attacks.