Immortals. They are a race of subhumans who are born with the Quickening within themselves but they are born like normal mortals. The seed of immortality can only be triggered by the shock of a violent death or else the Pre-immortal will grow old and die. Like humans, immortals need to eat, breathe and sleep so that they can keep up their strength.
Unlike normal humans immortals posses great powers and they can sense other immortals. When two immortals meet they duel each other with swords or any other bladed weapon which they are always armed with. When one immortal beheads another in a duel the strength, knowledge, skill and life force of the deceased immortal flows into the victor and makes him stronger. This is known as the Quickening and it is what drives the immortals to kill each other. However when a mortal beheads an Immortal they will only recieve their knowledge and skill.
The lives of the Immortals revolves around "The Game". When there are only a very few immortals left they will feel an irresistable pull to a far away land where the few who remain will battle to last. This is known as "The Gathering". In the end, there can be only one for "The Prize".