I was thinking recently that intellect devours, are a pretty easy for if you have good intelligence. On the other hand they are absolutely deadly if you have a bad intelligence score. It got me thinking, as an exercise, what other monsters are like that for the other stats?
I like kobolds for dex! The issue with grapplers is they can be contested by strength or dex. I couldn’t really think really think of anything where if you fails strength check; you are in a really really bad place