Asphyx is the unique Discipline of the Brothers of Ypres, a bloodline forged in the trenches of World War I by Kindred doused in toxic chemicals. Asphyx is a discipline for committing chemical warfare against the enemy; because chemical poisoning has little effect on the undead vampires, its use is mainly against mortals and other supernatural beings. For more details, purchase the Ancient Bloodlines sourcebook for Vampire: the Requiem.