Line of sight

Overview
Line of sight is a term that refers to the sight of an actor.

It is commonly used to describe the act of putting objects between yourself and an enemy to avoid receiving damaging effects.

Line of Sight and Casting
As most abilities cannot begin or complete a cast without having direct line of sight on a target, it is a common tactic to stay near an object or corner to easily prevent any enemy spell casts from finishing that may target you.

Line of Sight and Targeting
You may not target enemies or allies that you do not have a direct line of sight on. This can be used to prevent an enemy targeting you during combat.