So, the PF necromancer has the ability to control 8 HD of undead a level, which seems a bit excessive at best. It doesn't really go into details about how this ability works, that I can recall. How does it work with intelligent undead. And more importantly, how will it work in Scarwall, which is practically wall to wall undead? This could lead to some pretty anticlimatic moments.
It's extraordinarily badly stated, but the idea is that a Pathfinder necromancer can control 8 HD per level of skeletons/zombies he creates with Animate Dead, rather than the 4 HD per level that the spell usually allows.