In the revealing tweet, Psylocke is described as, "Lethal. Fierce. Merciless."
Psylocke is played by Olivia Munn, and the white horse and bow featured in her post mark her as Pestilence.
The Psylocke poster follows posters for Angel (Ben Hardy) and Storm (Alexandra Shipp), who – along with Magneto (Michael Fassbender) – make up the Four Horsemen of Apocalypse (Oscar Isaac).
Check out all three posters in the gallery below, and learn more about the Horsemen in the new X-Men: Apocalypse featurette.
Since the dawn of civilization, he was worshiped as a god. Apocalypse, the first and most powerful mutant from Marvel's X-Men universe, amassed the powers of many other mutants, becoming immortal and invincible. Upon awakening after thousands of years, he is disillusioned with the world as he finds it and recruits a team of powerful mutants, including a disheartened Magneto (Michael Fassbender), to cleanse mankind and create a new world order, over which he will reign. As the fate of the Earth hangs in the balance, Raven (Jennifer Lawrence) with the help of Professor X (James McAvoy) must lead a team of young X-Men to stop their greatest nemesis and save mankind from complete destruction.
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Batman v. Superman: Dawn of Justice is now playing in theaters.