So Mechty's getting a new expansion key that basically turns her into Corrosion Suomi
>Leap Key: Somnambulist Rampage
At the start of battle, enter the [Somnambulism] state and gain the new skill [Awakening Command].
At the start of a turn, if in the [Somnambulism] state, consume all of your own Contamination Index to gain full stacks of [Sleep Aid Kit]. Based on the consumed Contamination Index, dispel your own debuffs and grant all allied units [Dream-Fueled Excitement], increasing the Acid Damage dealt by the holder.
At the end of an action, if in the [Somnambulism] state, based on the number of [Sleep Aid Kit] stacks, unleash [Remnant Dream Bullet] on the nearest enemy unit and restore HP and Stability Index for all allied units.
>[Somnambulism]
Unable to move or use active skills, not protected by cover, immune to control effects. Upon entering this state, apply [Dream Shield] and [Dream Guardian] to all allied units and enter [Frenzied Combat Mode]. For every certain amount of Contamination Index consumed, apply [Dream Shield] to all allied units.
>[Awakening Command]
Cancel the [Somnambulism] state and gain additional movement.
>[Remnant Dream Bullet]
Alternately triggers the active skill [Explosive Dream Tide] and the normal attack [Pre-Sleep Warm-Up].
Before attacking, apply [Toxin Surround] to enemy units within the effective range. The effective range of [Explosive Dream Tide] is increased, and the damage multiplier of [Pre-Sleep Warm-Up] is enhanced.
https://old.reddit.com/r/GirlsFrontline2/comments/1lcpyy3/new_expansion_key_for_mechty/
TLDR She goes to sleep and becomes immoble and unable to use actions, and will automatically applies a shield and heals all allies.