Alien vs Predator: Alien Crusher Expansion

From the publisher: The Crusher caste encountered on Acheron (LV-426) Still remains a mystery to USCM. No obvious host of Origin can be determined, originally presumed to be an Adolescent Queen this theory was quickly dismissed. The Crushers large head crest, which at this time is believed to be bulletproof, Becomes the Prime Weapon of Choice, Charging its prey to inflict massive blunt force trauma.