I don't want to be here; I wish I wasn't me.
The Armor of Disassociation usually takes the form of a nondescript but rugged jacket, the sort most people's gaze slides off like water off a rock. On the inside, it gleams from threads spun from conquered fears and past terrors, locked away within the jacket. It is a little stiff to wear, usually a size too small or too large, but the kind of discomfort that fades into the back of the mind with time. Only after the wearer has grown accustomed to wearing it does the Armor work its powerful magic.
It is an artifact of protective power that taps into the fears of its wearer and changes both itself and them to match the threat they face. The wearer becomes someone else, someone better suited to face the problem, and the Armor transforms to match them. It draws power from those daydreams of power or 'I would have/should have', and turn them into a reality.
There's a voice in your head, and it's telling you not to worry. Some see this avatar when they don the Armor, a silhouette against fading light.
The change is not just physical but divorces the wearer's trauma from them, for a time. When terror looms and echoes of old pain reverberate loudly, the Armor acts on its own. First, the wearer's posture changes and subtle cues in body language or expression twist, followed by a slight physical transformation, before the mind is subdued behind the new, invented personality. While the Armor works, the true personality of the wearer slumbers, far beyond reach in the sanctuary of their own minds. What they see there varies from person to person, but is fantastical and strange.
The whole transformation takes at most ten minutes, and changes as much as a decimeter in height and or ten kilograms in mass have been observed. A simulacrum of skills is provided to the faux-person, and has ranged from charm and wit to martial arts. Though powerful, use of the Armor is not without danger. The wearer has no control over the action of their alternative persona, or even awareness. Some become used to the Armor's protective embrace, and let it live their lives.