DND_Reborn
The High Aldwin
I did the math on this one per DMG guidelines. It comes to defensive CR 1 and offensive CR 1/4. 1 + 1/4 = 1.25. divide by 2 comes to more than 1/2, so round up to 1.
It's a relatively weak CR 1, but by the math that where it lands.
EDIT: people, there's no need to guesswork. There are literally formulas to work this stuff out, and I'm confident you all have the book in which they appear.
LOL, I did the math as well, and you should check your work.
Defense: 7 hp would be CR 1/8, increased to CR 1/4 because of AC 13 increased to AC 15 raises CR level one stage (1/8 to 1/4)
Offense: 7 damage would be CR 1/2, increased to CR 1 because of attack +3 increased to attack +6 raises CR level one stage (1/2 to 1)
So, maybe you just put them down backwards because the Defensive CR is only 1/4 while the Offensive CR is 1. The total is still 1.25, divided by 2 is 0.625.
Also, you are rounding in the wrong direction. "Rounding the average up or down to the nearest challenge rating to determine your monster's final challenge rating." The average is 0.625, which rounds down closer to 1/2 than up to 1.
So, the CR should be 1/2.