This ability creates a concave force field which blocks all projectiles from one side and lets all projectiles through from the other.
The force field exists for certain period of time and degrades from enemy damage. The remaining lifetime is indicated by the field's color. The shield has a maximum duration of 8 seconds, decreased by enemy fire.
Particle field does not block melee attacks, Electric Smoke or Cluster Missile explosions (however, the missile itself will explode upon impact).
In Titanfall 2, the Particle Wall is restricted to the Tone-Class Titan and its Prime variant. It functions basically the same, however, as the first game.
Aside from the base Titan variant, there are several other uses of Particle Shield technology; the Gun Shield, used by Legion, is a Particle Wall wrapped around the Predator Cannon.
Pilots also get their own Particle Wall variants, being the Hard CoverBoost and the A-Wall tactical ability. They both function the same as their Titan variants,with the exception of being smaller and the latter Amping the weapons fire that passes through the wall.
IMC Marines also use portable particle shields and Spitfire LMGs to provide cover fire and advance into enemy territory. These shields have a stun ability akin to the effects produced by the Arc Grenade, slowing and damaging those who touch it.