If the player saves and quits, however, the shadow warrior must be resummoned when the game resumes. When injured, a shadow warrior heals over time. Once cast, the Shadow Warrior stays with the player until she is destroyed, at which point a new one can be created. Shadow Warrior is one of the few spells the Assassin may cast within a town. Shadow Warrior gains +4 resistance to all per level, to a max of level 75. Source Skill bonus +(1-3) Cloak of Shadows (Assassin Only) can spawn on ilvl >11 Exceptional and Elite claws (Hand Scythe and higher).

However, it can be cast again by Shadow Warrior before duration expires. Traps that the Warrior (or Master) lays out will also count towards the user's total limit of traps, potentially overriding their own trap placement. Cannot be cast again until duration expires. Some Skills have synergies, which provide benefits to other skills on the same Skill Tree. Skills usually define a character's playstyle and are divided by Class and Skill Tree. The level of the skills the Shadow Warrior uses are equivalent to 1/3 of its own skill level + 1/2 of the level of the skill being used, rounded up. Cloak of Shadows is part of the Shadow Disciplines Skill Tree and requires level 12 to be unlocked. With this skill, one can summon a copy of themselves that can use the two abilities assigned to the left and right mouse buttons at any given time while the Shadow Warrior is alive (though it cannot cast Shadow Warrior or Shadow Master). The Shadow Warrior makes use of normal attack and the two skills the Assassin has readied for herself.

The Assassin trained in this discipline has the ability to project a 'shadow' of herself.

Diablo 2 wiki cloak of shadows