Aren't mindflayers high level enemies? Up to level 10 suggest to me a low level adventure, yet what was marketed so far a high level threats.
Nope, they are CR 7~8 enemies. Meaning that one Mindflayer is a boss enemy for a party of 4 lvl 8 characters.
Which is interesting, because one of the character's master is a CR 13(?) enemy. I wonder if we'll get resolution for that character now, or if they won't be following CR, or if we just won't see any awesome enemies beyond a CR 10.