New Warriors (2008-2009)

New Warriors (vol. 4) is a series lasting 20 issues from 2008 to 2009. It is set in the aftermath of Civil War and during the Superhuman Registration Act era. It features a team of mutants who lost their powers during M-Day.

X-Termination: X-Treme X-Men (2012 - 2013)

X-Treme X-Men is a series that started in July 2012 written by Greg Pak. The title is involved in the short crossover X-Termination along with Astonishing X-Men and Age of Apocalypse.

Hellfire Club

To most of its members, and society at large, the Hellfire Club is merely a respectable, upper-class social organisation principally devoted to giving spectacular parties where members of social, economic, and political elite could meet unofficially to discuss matters of mutual interest, and to forge political or business alliances.

However, there exist a super-secret upper echelon of the Hellfire Club membership called the Inner Circle, unknown to society and the majority of Hellfire Club members, whose subversive members engage in a conspiracy to dominate the world through the accumulation of economic power and political influence. Members of the Inner Circle hold positions named after chess pieces to denote their standing within the organisation. 

The Hellfire Club Inner Circle now comprises of humans with 12 year-old billionaire, Kade Kilgore as the Black King. Kade eventually had members of the Inner Circle killed.

Anti-Mutant Forces

Mutants have always been subjected to fear and hatred from humans. Over the years, mutants have to face anti-mutant elements out to kill them.

Bastion
Abilities
Superhuman strength and durability; Flight; Energy projection; Command of other Sentinels; Ability to turn people into Prime Sentinels; Immunity to telepathic probes.

Apocalypse and his Horsemen

Apocalypse (En Sabah Nur)

Powers

Superhuman strength; ability to alter the atomic structure of his body at will to change form; ability to increase size by taking on additional mass from an extra-dimensional source.
Current Status
Killed by Fantomex in Uncanny X-Force #5 (2011)