Mob Damage Distribution

His swing range with those stats is 633~1120, which matches those numbers pretty well.
What's scorpion defense?

The 2 monster multiplier must be between and 61.34% and 62.4% with these numbers. Counting defense, it should be slightly higher. For reference, with Heal's formula, the number is 8/13 or 61.5%. They probably share a formula with this.

Gah, you beat me to it. I was doing the math when he didn't post his range yet though. I got about 66% for the min range, and 63% for the max range. I'm assuming that it's 2/3 damage to 2 monsters. Now try 3 ^_^

EDIT: Oh, you did 3. It's looking to be around 50% damage.