The mod makers said they attempted to keep Long War of the Chosen as close to Long War 2 as possible, but some changes were necessary because of differences between XCOM 2 and the War of the Chosen expansion. Encounter entirely new enemies that force you to adapt your tactics.Play with buffed-up SPARKs and more challenging Alien Rulers if you have the corresponding DLCs installed.Train up officers that provide powerful buffs and abilities for your squad.Get up to two of each faction soldier class, all of whom have been completely reworked from War of the Chosen.Make use of eight new soldier classes that have three ability choices per rank and an extra rank (eight instead of vanilla's seven).Discover a new research tree with several new techs and a bunch of new Proving Ground projects.

Grapple with much more challenging versions of the Chosen both in the strategy layer and in retaliation missions (they no longer randomly spawn on missions).Watch as ADVENT reacts to your actions by strengthening regions (making missions more difficult) and sending retaliatory strikes on your havens.Send out multiple squads at a time, adjusting the equipment and composition to make sure they can infiltrate in time.Use those haven rebels to detect missions for you, which you must then infiltrate before they expire.Build up the resistance by contacting regions and recruiting rebels in their havens.

Just like its predecessors, Long War of the Chosen makes major changes to the vanilla game:

Xcom 2 long war 2 save editor