AC stands for armor class. This is the standard by which the power of armor in Hollow is judged. The higher the Armor Class, the more protection the equipment can give when fighting creatures. Sometimes AC stands in for WC (Weapon Class) which refers to how much damage a weapon can deal out. Once again, the higher it is the better. The maximum standard AC in Hollow is +4 per piece of armor, while the maximum standard WC is +10. Players who wish to purchase custom weapons or pieces of armor can do so with higher WC or AC, to a maximum of +15 for weapons or +10 for armor.