From Raging Swan's website:

Claiming the windswept uplands of the Bleak Moor as their own, the Centaurs of the Bloodied Arrow jealously guard their territory. Locked in a death-struggle against the ferocious strength of the minotaurs dwelling in the Black Hills these puissant, but unpredictable and suspicious fighters harry all who dare encroach upon their realm.

Centaurs of the Bleak Moor presents:

• Six new feats
  
• Four new spells
  
• Three new magic items used by powerful tribal members
  
• Ten stat blocks (ranging in CR from 3 - 10)

Centaurs of the Bleak Moor is designed to complement Minotaurs of the Black Hills, but ownership of that supplement is not necessary to place this tribe in a GM’s personal campaign.