Last week during E3 2017, developer Firaxis and publisher 2K announced XCOM 2: War of the Chosen, the first expansion for XCOM, and largest one in the series (twice as long as any previous expansion) to date.

That being said, today, the pair released character trailer highlighting one of the expansions' enemy units: the Assassin. The Assassin is said to be a stealth-based melee unit who prefers to fight at close range with her huge, purple glowing, Katana.

She pertains the ability to vanish from sight, which allows her to get in close on unsuspecting soldiers and unleash a powerful slash. The unit can also stun and disorient groups of soldiers with Harbor Wave, an ability that sends a flood os psionic force from a distance.

In case this is your first time hearing about it -- XCOM 2: War of the Chosen is described as a adding new extensive content in the fight against ADVENT when additional resistance factions form in order to eliminate the alien threat on Earth. In response, a new enemy known as the "Chosen" emerges with one goal: recapture the Commander. The expansion includes new Hero classes to counter the Chosen, new enemies, missions, enviroments, and increased depth in strategic gameplay. Below, you can view an official rundown of its features:

New Factions and Hero Classes

Three additional factions have emerged to strengthen Earth’s resistance – the Reapers, Skirmishers and Templars – each with its own unique abilities and contrasting philosophies. These factions provide powerful hero class soldiers to aid in missions and new opportunities for the strategy layer.

The Chosen

The Chosen are the most cunning enemies XCOM has ever faced, each with unique strengths and weaknesses that will be introduced with each new campaign. The Chosen are on the hunt for the Commander and will kidnap, interrogate, and kill XCOM’s soldiers to complete their objective. The Chosen can also invade the strategy layer and ravage XCOM’s global operations. Find and raid the Chosen’s strongholds to defeat the enemy for good.

New Alien and Advent Threats

A deadly new alien known as the Spectre, capable of creating dark copies of XCOM soldiers, has snuck onto the battlefield. Adopt new tactics to counter it as well as the explosive attacks of the ADVENT Purifier and the psionically charged ADVENT Priest.

New Environment and Mission Objectives

Engage in tactical missions across new environments from abandoned cities devastated by alien bioweapons during the original invasion, to underground tunnels and xenoformed wilderness regions.

Enhanced Strategy Layer

Manage XCOM’s relations with factions and counter The Chosen’s operations from the Avenger. Employ new Resistance Orders to prioritize your personal strategy. Soldiers, scientists, and engineers can now be deployed for Covert Actions that award supplies and boost faction favor if successfully completed.

Greater Customization and Replayability

Soldiers can develop bonds with compatible teammates for new abilities and perks. The SITREP system dynamically adds new modifiers to the tactical layer to make sure every mission provides a unique challenge. Advanced campaign options allow for finer adjustments to game length and difficulty.

Challenge Mode

Utilize the perfect strategy in new regular one-shot community challenges to claim the top spot on the global leaderboard.

XCOM 2: War of the Chosen is set to launch on August 29th on PS4, Xbox One, and PC at an unknown price-point. Below, you can check out the Assassin in the new trailer: