Some abilities won't break concealment - you can use most non-offensive abilities, as well as scan the area, or even heal your units.

Concealment phase allows your units (in moderation) to move around the map by sprinting - the chances of stumbling upon enemy units are rather small.

The enemy won't be able to notice your units if there's no direct line of sight between them, but if they are approached from the side, of from behind, it won't help your units and they will be noticed.

You can approach the enemy from an extremely short distance, such as 1-2 squares, provided that there's a cover, or an obstacle between both units.

Concealment is broken when one of your soldiers performs almost any action (like throwing a grenade, attacking an enemy and even hacking), or if they simply make a lot of noise - by bursting through the door, or by smashing a window.

You should remember about a number of things: Both of those abilities make the ranger a powerful reconnaissance unit, allowing the soldier to sneak up on an unsuspecting enemies. Conceal ability allows the Ranger to enter concealment once more.

Additionally, the unit will be able to enter concealment even during those missions, where it's normally unavailable. The Phantom ability allows the unit to remain concealed (provided that it wasn't that unit that was seen by the enemy) even when the rest of the team was seen. If one of your units steps on that field, or fires his / her gun, the concealment will be broken and the enemy will be able to see all of your units.ДЄ thing worth mentioning is the fact that the Ranger class has access to a number of abilities which modify (for that single unit) the concealment mechanic. It's represented by special, red icons on the ground, which show you the 'sight range', spreading a few squares in each direction from each enemy unit. While on the battlefield, your units will be able to approach the enemies from a really close distance before they are noticed. Aliens simply won't have any idea about the existence of your units and they will simply mind their business.Д¬oncealment is given to units at the beginning of most missions (aside from the Retaliation-type ones). It's not the icon that matters though, but the thing it represents - as long as it's active, your units will be practically invisible to the enemies. While it is active, your soldiers will have a small icon representing a hooded person next to their names. One of the biggest novelties in the XCOM 2 is the Concealment mechanic. Concealment phase allows you to prepare a deadly ambush for your adversaries.

Xcom 2 aliens not attacking