Long War of the Chosen is primarily a port of the existing Long War 2 mod created by Pavonis Interactive. And Smarter battlefield AI ADVENT strategic AI that tries to counter your moves. Dozens of new enemies including “The Chosen” who will invade your missions unannounced and make things harder for the XCOM project. Two new weapon tiers, Lasers and Coilguns. Thirteen Soldier classes: Reaper, Templar, Skirmisher, Sharpshooter, Shinobi, Ranger, Assault, Gunner, Grenadier, Specialist, Technical and Psionic Operative (plus Sparks for DLC owners), each with unique secondary weapons and unique skill trees. Manage resistance Havens and have resistance members scrounge for supplies, gather intelligence or recruit more people to your cause. New Infiltration mechanics that require you to send out multiple squads at once. Some other changes include: A much longer and more challenging campaign, running for 100 to 120 missions on average (200-300 hours).
The mod integrates the custom classes introduced in Long War 2 with the new Faction Hero Classes introduced in the War of the Chosen DLC.
One of the most significant changes is the increased number of soldiers the commander can take on each mission, allowing for more rapid promotions. Long War of the Chosen is a total conversion mod that makes significant changes to XCOM 2 with the War of the Chosen DLC Enabled, such as making the global mission selection screen, the Geoscape, a battlefield unto itself.