The sorcerer solidifies the shadows around their body. In addition to making them harder to see, this shadow armour also protects them from harm.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Spell Level 3Casting Value: 9+
Armour of Darkness is an augment spell that is cast on the Wizard itself. Until the start of the caster's next turn, all missile fire directed at him or his unit suffer -1 To Hit. In addition, the unit adds +1 to their armour save. The caster can choose to have this spell target all friendly units within 6". If they do so, the casting value is increased to 18+.