The Chosen and the resistance factions are woven seamlessly into the familiar XCOM 2 campaign structure. They can blow up scenery with a well-placed shot and throw claymores without breaking stealth. Reapers can remain in stealth for most of a battle, with a bit of luck.
Skirmishers can use their grappling hook and high movement speed to zip around the battlefield and drag enemies out of position. Templars are roaming assassins that can dart out of cover, kill an enemy with their psionic blades, and dart back into cover again. These are the most powerful and exciting troops in the whole Firaxis XCOM series so far. Earn their trust and they will help you to chase down the Chosen, and give you access to powerful specialist class options: skirmishers, templars, and reapers. You have some help, fortunately, in the form of three new resistance groups.