The devil and his angels.
It was a choice left up to people whether they would participate in that. As things currently are post-Fall, if people will not accept the rescue of Christ, they will. As slaves of Satan.
People should choose wisely.
Do you take these literally? And are they related?
Mal 4:1 "For behold, the day is coming, Burning like an oven, And all the proud, yes, all who do wickedly will be stubble. And the day which is coming shall burn them up," Says the LORD of hosts, "That will leave them neither root nor branch.
Mat 10:28 And do not fear those who kill the body but cannot kill the soul. But rather fear Him who is able to destroy both soul and body in hell.