Question About Monster Defenses...

[Scribble]

A monster’s level determines its defenses. A given defense based on an average ability score is equal to 12 + the monster’s level.

For every 2 points the ability score varies from the average,
adjust the defense by +1 (if higher) or –1 (if lower).

Is that based on average being 10? Or Average being:

On average, the highest ability score of a pair is equal to 13 + one-half the monster’s level.

 

[Eldritch_Lord]

I think it's the latter; someone around here made a monster creator using 13+1/2 level and it was mostly accurate, though practically every monster has some sort of fudge factor for defenses anyway.

 

[Scribble]

I think it's the latter; someone around here made a monster creator using 13+1/2 level and it was mostly accurate, though practically every monster has some sort of fudge factor for defenses anyway.

Yeah looking into it a bit more, it does seem like the latter.