In Assassin's Creed Unity for the PS4, Combat was meant to be rebuilt, with fencing being used as an inspiration for the new system. In addition to returning weapons from previous games, Assassin's Creed Unity introduces the Phantom Blade. The Phantom Blade uses the mechanics of a crossbow to fire a silent projectile a great distance, while still serving the same role as the Hidden Blade in previous Assassin's Creed games. Navigation for the game was also overhauled: new "Free-run up" and "Free-run down" commands were added to make it easier for the player to scale buildings in either direction. Additionally, Arno learns new park-our moves throughout the game, but the player can also purchase new skills as well.
For the first time, the series allows players to customize the characters abilities, adopting a skill tree that enables players to assign points earned through gameplay to improve their skills in stealth, mêlée & ranged combat, and health. Players are also able to customize their weapons, armor and equipment to further complement their individual style of play. Players also have a wider selection of weapons available, including swords, axes, spears, pole-arms, pistols and throw-able items, such as smoke bombs. Assassin's Creed Unity also introduces cooperative multiplayer to the series. Players can enter taverns, which act as social hubs in the game, where you can see if any friends are playing the game at the current time.
When you start the game, the story begins with you, the player, playing through a memory of the sacking of the Paris Temple and the capture of Templar Grand Master Jacques de Molay in 1307. During the sack, de Molay entrusts another Templar with a sword and a book, which the Templar hides within a French crypt. The memory then fast forwards to de Molay's death at the stake, and his curse towards King Phillip IV and Pope Clement V. At this point, the Assassins hijack the memory sequence and implore the player to join them as an initiate. The Assassins provide an internal Abstergo video memo, in which Abstergo describes the capture of a Sage who contains precursor DNA.