Like the Enemy Unknown‘s Assault class, Rangers are often very up-close-and-personal heavy damage dealers. Their biggest change this time around is enhanced by just synergy with the new concealment mechanics. This is able to dish out plenty huge damage in single shots, and Rangers are very perfect for finishing off the most imminently threatening all the enemies on the field.
The Scout tree focuses on stealth, Is responsible for allowing your Rangers to widely extend and abuse the tactical advantage granted by concealment. You need to know that Rangers with the Phantom ability ability always start missions in concealment even when the rest of the squad does not, you need to start making them perfect for scouting ahead to determine the enemy locations or just to quietly completing the mission objectives while their colleagues distract Advent. Even used purely for combat, the combination of Phantom, Shadow Strike, Conceal, and Rapid Fire can allow for catch enemies unaware multiple times per mission with a devastating flanked attack from the shadows. Implacable and Untouchable together allow for Rangers to remain relatively safe even after sneaking up closely for a surprise kill.
Assault instead emphasizes the Ranger’s new sword for melee attacks. Blade master, Shadow step, and Reaper can also combine into a nasty devastating chain attack that rapidly finishes off a group of aliens that has already been softened up, such as by a Grenadier’s bombardment. Untouchable is the key for survival if you ever go this route, along with any equipment and PCS upgrades that improve durability. Vital tech upgrades to the sword can be built only after the Stun Lancer and Archon autopsies. Both builds are greatly supported by the Spider/Wraith Suits from the Proving Ground and the enhanced mobility that they provide.