Delta 6 (The Pack)

Delta;

-The fourth letter of the Greek alphabet
-A codename used to represent the letter 'D'
-A brand name

...

-In some places, a mathematical term meaning 'change in'

~~~

At birth, every person- human, mutant, hybrid, everyone- is born with a gemstone on the top of their right hand. This gemstone is always green, or in rare cases, gold if they're born into royalty. As a person ages, the gemstone will change colours depending on the role they take on. Most remain green, many become purple, a handful become blue, very rarely some become gold, and an unlucky few become red. A person can be killed, but they have the ability to 'respawn' unless their gem is destroyed.

But there are another two other colours as well. White and black. Notch, the ruler, is the only living being with a white gemstone. He has unfathomable power, which can not be matched by any gem... Except black. Black is the rarest gem besides white, and tales of black gems pass like whispers in the wind, bringing a feeling of uneasiness and despair. Very few beings have had black gems, and the few that have, had been killed or banished by Notch long ago. Entity303, Null, these are the holders of black gems. Luckily, no one has seen a black gem for decades now. Everyone believes they are extinct. But as you know... A gem can never truly go extinct. For all gems can change. And now a new black gem has arisen, and he calls himself... Herobrine.

Herobrine is a black gem unlike anyone has ever seen, and it's not long before he has 'killed' Notch. But Notch has one last trick up his sleeve, and as his last resort, in his last few seconds of his life, he gives up his white gem, and becomes green. The power of the white gem shatters, and splits into six, the power along with a message falling across the land. Notch in his last moment had bestowed his power upon six people, and now it's up to them to untie, slay Herobrine...

And revive Notch.

~~~

(Rest of description in book)