Prototype of Feist's Metal Crab
The Prototype of Feist's Metal Crab or simply Metal Crab Prototype is a Support Device in Arknights, deployed through Stainless' first talent Battlefield Engineer when his namesake third skill is used.
Uniquely for a Support Device, the Metal Crab Prototype is more of an offensive summon like that of Summoner Supporters' summons, and sets itself apart from other summons by being treated as a hostile target; the Prototype will actually be attacked by friendly units if it is within their range, but it takes no damage whatsoever from friendlies' attacks, has an aggression level of -2 (lower than that of Ambusher Specialists), and will not be attacked by enemies. Nevertheless, this can be abused by Operators whose skills have offensive SP recovery to charge up their skills quicker at no detriment.
The Metal Crab Prototype has a skill where it fires its main gun at enemies within a range of 2×3 tiles ahead with a 1-tile extension up front when charged (which has defensive SP recovery), dealing heavy Physical damage (that is calculated by Stainless' ATK instead of its own ATK) to the target and half of it on enemies around the target at the cost of 2.5% of the Prototype's maximum HP, which can destroy it (meaning a single Prototype can fire 40 shots before self-destructing); when it is attacked by an Artificer Supporter (including Stainless himself) however, the Prototype restores 1% of its maximum HP, this being the only way to heal it.
The Prototype also reduces the Physical damage taken by the friendly unit right behind it.
Stats
Range
□□
■□□□
□□ |
Attributes
| Trait |
|---|
| Can be attacked by Operators but does not take damage; recovers HP when attacked by Artificer Operators |
| Level | 
|
|
|
MAX
|
|---|---|---|---|---|
 HP
|
N/A | 6000 | ||
 ATK
|
N/A | 100 | ||
 DEF
|
N/A | 2000 | ||
 RES
|
N/A | 0 | ||
 Redeployment time
|
N/A | 20 seconds | ||
 DP cost
|
N/A | 10 | ||
 Block count
|
N/A | 0 | ||
 Attack interval
|
N/A | 1 second | ||
| Aggression level | N/A | −2 | ||
| Addendum | ||||
| The Prototype Metal Crab restores 1% of its maximum HP each time it is attacked by an Artificer Supporter (including Stainless himself). | ||||
Talent
| Power of Unity | |
|---|---|
|
Cause an allied Operator in the tile behind to take 20% less Physical damage, unlimited duration |
Skill
|
Prototype of Feist's Metal Crab Defensive Recovery Auto |
|---|
| Level | Effect | 
|
|
|
|---|---|---|---|---|
 |
When skill is activated, lose 2.5% HP, deals 200% ATK as Physical damage to an enemy, and deal 100% ATK as Physical damage to nearby enemies in a small area | 0 | 5 | – |
 |
When skill is activated, lose 2.5% HP, deals 210% ATK as Physical damage to an enemy, and deal 100% ATK as Physical damage to nearby enemies in a small area | 0 | 5 | – |
 |
When skill is activated, lose 2.5% HP, deals 220% ATK as Physical damage to an enemy, and deal 100% ATK as Physical damage to nearby enemies in a small area | 0 | 5 | – |
 |
When skill is activated, lose 2.5% HP, deals 230% ATK as Physical damage to an enemy, and deal 110% ATK as Physical damage to nearby enemies in a small area | 0 | 5 | – |
 |
When skill is activated, lose 2.5% HP, deals 240% ATK as Physical damage to an enemy, and deal 110% ATK as Physical damage to nearby enemies in a small area | 0 | 5 | – |
 |
When skill is activated, lose 2.5% HP, deals 250% ATK as Physical damage to an enemy, and deal 110% ATK as Physical damage to nearby enemies in a small area | 0 | 5 | – |
 |
When skill is activated, lose 2.5% HP, deals 260% ATK as Physical damage to an enemy, and deal 120% ATK as Physical damage to nearby enemies in a small area | 0 | 5 | – |
 |
When skill is activated, lose 2.5% HP, deals 270% ATK as Physical damage to an enemy, and deal 130% ATK as Physical damage to nearby enemies in a small area | 0 | 5 | – |
 |
When skill is activated, lose 2.5% HP, deals 285% ATK as Physical damage to an enemy, and deal 140% ATK as Physical damage to nearby enemies in a small area | 0 | 5 | – |
 |
When skill is activated, lose 2.5% HP, deals 300% ATK as Physical damage to an enemy, and deal 150% ATK as Physical damage to nearby enemies in a small area | 0 | 5 | – |
| Addendum | ||||
| ||||