Nights
Unlike Sitghelt and Arkedss that were born by the cycle, Nights were planned by them. First Night occurred when one of the Arkedss people, fall with their emotions by planning to marry one of the Stighelt people.
When the planetary elders heard about it, they began brewing up a rumor.
This was how the first Night got born. Not knowing what they did to make it existence spread out entirely. If Arkedss sucks the powers from the 'Nights' , 'Nights' also slaughter and can control the host by making it unable to fight back the urge of receiving a good amount of 'greedy energy'.
Different from Stighlet since they convert the Dark powers into light.
Spark and Flame was not part of the process , it was part of something sinister than the cycle can hold.
What will happen to humans if the Nights will consume them?
They are called 'Railers' , since humans have no powers, they will be dead in the process. Just like there existence, humans only contribute a little support. At least they are not extinct.
What will happen to the Arkedss that become one of the Nights?
They are given two options of survival:
(1) Be a full Night
(2) Take the second chance and control greed that runs through the host.
If the host fail to keep the second option, they will attack aggressively and become creatures until they kill themselves without knowing who they were.
And lastly the Stighelt?
They started the creation of Nights, so Stighelt need to plan how to end the Nights.
Gifts
-- Gift
received Weekly Power Status
-- Power
Ranking 
-- Power
stone