The Lost are a new type of enemy introduced in the War of the Chosen DLC.
The Lost are the victims of the bio-weapons used over the course of the original invasion during Alien Abductions. While the bio-weapons paved the way for ADVENT to clean up and re-create the new city centers, colonization after the invasion is still in progress over the course of XCOM 2. ADVENT deploys Purifiers in these abandoned cities to clear out The Lost in an effort to salvage resources and reclaim land.
The Lost come in swarms, and they will continue to spawn constantly on missions they appear on. Explosions will cause new swarms to appear faster, as The Lost are sensitive to sound. The Lost also take extra damage from fire-based weaponry.
The Lost are not affiliated to anything besides themselves; they will attack Aliens and ADVENT on missions they appear on if it is more convenient for them to do so.
Attacking any Lost unit with a Standard Shot triggers a mechanic called Headshot; killing a Lost with a standard shot does not cost an action. This means that a single soldier can kill multiple Lost in a single turn only limited by ammunition.
- The Lost will only activate aliens when both pods are in sight of a squad member. The aliens will be active from this point and can attack your squad if the opportunity to flank or use an area attack exists.
- The Lost count as humanoid targets, meaning they are vulnerable to Justice, Void Conduit, pulling from Frostbite, and being resurrected as a Psi Zombie.
- The Lost are especially vulnerable to incendiary weapons. They take additional damage from Burning and will stop attacking while affected. Flamethrowers and Hellfire Projectors have a better chance to hit, and the leftover fires can block off incoming swarms. It's possible for a swarm to spawn directly on top of fire created in this way, making it worthwhile to launch Incendiary Grenades/Bombs at key choke points.
- The lost cannot attack up ladders or across any full tile half-cover. High ground and store counters can be used to form an impenetrable bunker, keeping in mind that anyone blocking a ladder within alien line of sight is likely to take a flanking shot.
- If the Headshot mechanic applies, the action will be labeled "Headshot" in the HUD. Certain sidearms (like the Templars' autopistol or Sharpshooter's pistol) can use Headshot and have unlimited ammo; this can be very effective for clearing out low-strength Lost or finishing off wounded ones.
- Despite being biological and having intelligence, all of The Lost are immune to any attack that requires it to pass a Will test, such as the Psi Operative's Insanity or the SPARK's Intimidate.
- The Ultrasonic Lure forces The Lost to target anything within the blast radius. This can be used in conjunction with explosives to sic a swarm of dashers onto the aliens.
- Explosions attract The Lost, but this does not count things that do not explode, i.e. Flamethrowers, Shredder Guns, Plasma Blasters, etc. Players should bring those heavy weapon types on missions as opposed to explosive alternatives.
- Blademaster Rangers are especially useful against the Lost once they have the "Bladestorm" ability. Lost that try to attack Rangers with Bladestorm will be very likely killed, provided the attacks don't miss or they aren't a Lost Brute, which rarely dies in one hit.
- Multiple Lost strikes count as a single attack for the purposes of Parry and Untouchable. This makes it possible to safely body block choke points.
The Lost Units Edit
- Lost: The standard Lost unit that makes up the bulk of Lost swarms. They're scattered around the initial map, and more can spawn in during a Lost Swarm.
- Lost Dasher: A faster variant that is spawned in when a Lost Swarm occurs. They will easily catch up to anyone that isn't making full length dashing moves to get away.
- Lost Brute: A tougher variant with a much larger health pool and damage range. While they don't have much mobility, their health pool means they can easily end a Headshot chain.