In a PlayStation Blog post, community developer Gabe Graziani explains that each of the title's playable multiplayer characters will feature in the single-player campaign.
One of those characters is the Sentinel, "a former assassin who betrayed the Brotherhood to join the Templars". Being an assassin, the Sentinel relies on discretion and killing "quickly and quietly". But Graziani explains that the character is "not above the occasional flourish of brutality, crushing the life from his targets with a precisely placed stomp".
You can see the character in action — and get a glimpse of his back-story — after the jump.