Saeviomagy
Adventurer
The reason would be because he's combining manufactured weapons with natural weapons.Halivar said:I don't know where in the world you got this. Every monster I see in the MM uses its full strength bonus for its primary attack(s), and gets half-strength and -5 only to its secondary attack. That's why the primary attack, listed in the MM stat-blocks as "Attack", has the same exact attack bonus under "Full Attack", because only the secondary attack listed under "Full Attack" receives the -5 penalty (-2 with Multiattack).
He is correct in saying it's +0/+0/-2 with Multiattack.
The first number is an armed attack with a one-handed sword. It is at full attack bonus, and gets iterative attacks if the base attack bonus is more than 5.
ALL natural attacks are then secondary attacks, because the weapon attack was the primary attack.
Examples can be found in the description and example for the half dragon, half fiend, the lamia (who's primary claw attack in single attack mode turns into a secondary claw in combination with a dagger), the medusa etc etc.
Once you use full attack progression with a weapon, all your natural attacks are secondary attacks.