Arms

ArmFeedbackerModel.png

Arms are one of the main forms of the combat in ULTRAKILL, introduced before even picking up a gun. Having 3 variants (as of now), Arms have boast a lot of utility much like the weapons themselves. The default key to switch to another arm is G.

Mechanics

The Feedbacker and Knuckleblaster arms share a global value, referred to as Cooldown. When this value is zero and the player is not already current punching, the player is allowed to punch. This value decreases by 2 each second, and is increased by the Exhaustion value after punching. The Exhaustion value increases when the player punches depending on the arm that was punched with. With the Feedbacker, the value will be multiplied by 0.2 and then added to 0.5. With the Knuckleblaster, the value will be multiplied by 0.3 and added to 0.75. Exhaustion decays over time at a rate of the Exhaustion value divided by two, added to 0.1, for any Exhaustion value. To find the graph of the Exhaustion decay over time, use the equation: y=((C+0.2)e^-x/2)-0.2.

With this in mind, you can use the following system of equations to find the information related to the next punch:

<$>y_{1}=(A+0.2)e^{-x/2}-0.2<$> , finding current exhaustion, where A is starting exhaustion. Use zero for first punch.

f(x)=0.75+0.3y₁, where the y intercept finds starting exhaustion after you punch with kb. For Feedbacker, use f(x)=0.5+0.2y1

g(y)=f(0)/2, finding the time when Cooldown from the punch is zero, based on the graph of f's y-intercept and graphing it as a line of x

y₂=((B+0.2)e^-x/2)-0.2 finding the exhaustion decay of that punch, where B is f(0)

h(x)=0.75+0.3y₂, finding the exhaustion of the next punch, which can be input into A in the first equation to find the information regarding the next punch. Keep in mind, you can't punch before h(g(y)), since that's when Cooldown reaches zero. For Feedbacker, use h(x)=0.5+0.3y2

FEEDBACKER
Primary Fire
Damage	1
Cooldown	~0s (Exhaust)
Alternate Fire
Damage	5
Cooldown	~0s (Exhaust)
Damage Modifiers
None
Terminal Info
Fast punch with decent damage. Can parry most attacks, including shotgun shots and coins.
Obtained in
BY DEFAULT

FEEDBACKER

The Feedbacker is the first arm the player obtains, being equipped by default in the Tutorial section of 0-1: Into the Fire. It is a blue and black mechanical arm.

Mechanics

The default key to use the Feedbacker is F. When used, it will throw out a punch that deals 1 damage and has a small cooldown affected by arm exhaustion. By punching heavy enemies will award the player with the + DISRESPECT style bonus]. Killing any enemies by punching their weakpoint will award the player with the + CRITICAL PUNCH style bonus. Though continuously punching will increase the cooldown it takes to punch again, preventing spamming punches.

Punching any projectile or enemy during specific attacks with precise timing will Parry that attack or projectile, dealing 5 base damage to enemies that are parried and sending projectiles hurling back to enemies causing the projectile to explode in a moderately large area and (usually) cancelling their attack. Parries also fully heal the player up to their hard damage cap and refill all of their stamina.

Enemy projectiles have three mercy frames between hitting the player and the damage being applied, to make projectile parrying slightly more lenient. Up to two projectiles can be parried by a single punch, one that's inside the player (i.e., during the projectile's mercy frames) and one that's in front.

Usage

• Projectile Boosting

Parrying one of the Shotgun's projectiles with the Feedbacker will make it create an explosion on impact with a surface or an enemy that deals 3.5 damage and will award the player with the + PROJECTILE BOOST style bonus.

• Sawblade Punching

Punching one of the Sawblade Launcher's Sawblades will make it deal twice as much damage until it bounces or breaks.

• Coin Juggling

Punching a Coin with the Feedbacker will make it ricochet to the closest enemy, dealing 2 base damage and awarding the player with the + FISTFUL OF DOLLAR style bonus. Further punches on the same coin will add an extra 1 damage to it, up to a cap of 5 damage when coin is striking a surface and not an enemy.

• Screw Punching

Punching the Screwdriver Railcannon's screw while it's attached to an enemy will cause the player to perform a parry punch and hurl it towards where the player punched the screw, dealing 5 punch damage and 3 impact damage.

• HOMERUNs

Killing Drones or the Mysterious Druid Knight (& Owl) with a punch will give the + HOMERUN style bonus.

Advanced Techniques

• Multiparrying

For Strays, Schisms and Soldiers, it is possible to perform both an enemy parry and a projectile parry at the same time and for Malicious Faces and Mindflayers, it is possible to parry two of their projectiles with a single punch. These give the player multiple + PARRY style bonuses but the timing window is very tight and damages the player unless they dash beforehand.

• Self-Interception

Firing a hitscan weapon (Preferably a Revolver) at the same time as parrying a projectile causes the parried projectile to continue travelling after hitting an enemy, causing multiple explosions.

Tactics

Since parrying is incredibly useful to raise your overall damage output as well as replenish your health and stamina in a pinch, it becomes very useful during high waves in the Cyber Grind, where you are often in intense situations with projectiles targeting you at all angles.

Swordsmachines are very vulnerable to parries due to their large parry window and the damage dealt from the parry itself, making it an easy target for both style and regeneration. However, the only downside is that it will briefly become Enraged. On the other hand, parries deal a sizeable amount of damage against The Corpse of King Minos and will give the + DOWN TO SIZE style bonus.

It is also a key part of the fight against Minos Prime and Sisyphus Prime, where it will be your primary source of healing due to how difficult it is to heal off of their blood. However, on higher difficulties, the Screwdriver Railcannon may be your best choice for healing instead.

List of Parriable Attacks

All Parriable Attacks
Enemy	Parried Actions	Parry Type
HUSKS
Filth	Lunging Bite	MELEE
Stray	Hell Bullet Casting	INTERRUPTION (Melee/Projectile)
	Hell Bullet	PROJECTILE
Schism	Hell Bullet Casting	INTERRUPTION (Melee/Projectile)
	Hell Bullet	PROJECTILE
Soldier	Hell Bullet Casting	INTERRUPTION (Melee/Projectile)
	Soldier Kick	MELEE
	Hell Bullet Scatter	PROJECTILE
The Corpse of King Minos	Fist Punch	MELEE
	Open-Palm Punch
	Fist Slam
	Seeking Hell Bullet	PROJECTILE
	Hell Bullet
Sisyphean Insurrectionist	Malicious Flail	INTERRUPTION (Melee/Projectile)
Ferryman	Second Oar Attack	MELEE
	Second Kick
	Stinger
	Explosive Overhead
	Backstep
MACHINES
Drone	Hell Bullet	PROJECTILE
	Kamikaze Dive
	Hell Bullet Casting	INTERRUPTION (Melee/Projectile)
Swordsmachine	Three Slashes Combo	MELEE
	Running Slash
	Roundabout Throw
	Straight Throw	INTERRUPTION (Melee/Projectile)
	Shotgun Pellets	PROJECTILE
Mindflayer	Whip	MELEE
	Hell Seeker	PROJECTILE
Sentry	Scope Shot	INTERRUPTION (Melee/Coin)
Gutterman	Shield Bash	MELEE
	Punch
Guttertank	Whiffed Punch	MELEE
V2 (Both Fights)	Revolver Shot	PROJECTILE
	Piercer Charge Shot
	Shotgun Pellets
1000-THR "Earthmover"	Giant Hellseeker (Brain)	PROJECTILE
	Hellseeker (Security System)
	Mortar (Security System)
DEMONS
Malicious Face	Hell Bullet Volley	PROJECTILE
	Malicious Laser	INTERRUPTION (Melee/Projectile/Coin)
Cerberus	Apple Throw	PROJECTILE
Mannequin	Hellseeker	PROJECTILE
	Slash	MELEE
Hideous Mass	Hideous Mortar	PROJECTILE
	Harpoon	MELEE
Leviathan	Hell Bullet Barrage	PROJECTILE
Minotaur	Bull Charge	MELEE
ANGELS
Virtue	Divine Light	INTERRUPTION (Melee)
	Death Orb	PROJECTILE
Gabriel, Judge of Hell	Spear Throw	PROJECTILE
	Twin Axes
	Sword Toss
	Formation Swords (Higher Difficulties)
Gabriel, Apostate of Hate	Swift Strikes Finsiher	MELEE
	Frontwards Charge
	Heavy Hits
	Formation Swords	PROJECTILE
	Sword Toss
???
Very Cancerous Rodent	Explosive Hell Bullet	PROJECTILE
Mysterious Druid Knight (& Owl)	Hell Seeker Barrage (Fuller Auto)	PROJECTILE
	Hell Bullet Barrage (Full Auto)
	Kamikaze Dive	INTERRUPTION (Melee/Projectile)
Flesh Prison	Hell Seeker Twirl	PROJECTILE
	Piercing Stare (Eye Minion)	INTERRUPTION (Melee/Coin)
	Malicious Beam (Mini-MalFace)
Flesh Panopticon	Hell Mortar	PROJECTILE
PRIME SOULS
Minos Prime	Seeking Snake	PROJECTILE
	Dropkick ("Judgement")	MELEE
	Fist Slam ("Thy end is now")
Sisyphus Prime	Self-Destruct ("This will hurt")	INTERRUPTION (Melee)
	Stardust Breaker ("DESTROY")	MELEE
	Sumo Combo Finisher ("You can't escape")
	Sumo Clap ("BEGONE")

Details

• The name of this arm is a reference to the album Boris at Last -Feedbacker- (Or simply "Feedbacker") released in 2003 by Japanese drone metal band Boris.
• When an enemy's health is multiplied with a Spawner Arm or other methods, instakill parry conditions still apply. For some enemies like Sentries, the parry damage is increased instead.
• Using the Weapon Wheel to slow down time can make parrying easier.

Media

• 

  HUD Icon

• 

  Concept Art

• Punch

• Light Punch

• Heavy Punch

• Parry

KNUCKLEBLASTER
Primary Fire
Damage	2.5
Cooldown	~0s (Exhaust)
Alternate Fire
Damage	1
Cooldown	~2s
Damage Modifiers
None
Terminal Info
Slow punch with high damage and knockback. Hold Punch to blast shells inside the knuckles, causing a shockwave that knocks surrounding enemies away.
Obtained in
1-4: CLAIR DE LUNE

KNUCKLEBLASTER

The Knuckleblaster is the second arm the player obtains, dropped by V2 after being defeated in 1-4: CLAIR DE LUNE. It is a red and gray mechanical arm, with two protrusions at the top and a fist with three clawed fingers.

The default key to use the Knuckleblaster is F. When used, it will throw out a punch that deals 2.5 damage, hefty knockback to enemies and has a long cooldown affected by arm exhaustion.
Punching heavy enemies will award the player with the + DISRESPECT style bonus.
Killing any enemies by punching their weakpoint will award the player with the + CRITICAL PUNCH style bonus.
If its keybind is held down, the Knuckleblaster will blast a shockwave that deals 1 damage and can be used to launch enemies and deflect most projectiles.
Killing weak enemies with a direct Knuckleblaster punch makes them splatter, healing over 100 health.

Punching Sentries with the Knuckleblaster after they've burrowed into the ground and start charging their turret will force them out of the ground.
Punching light, non flying enemies into the ground with the Knuckleblaster will instantly kill them and give the + SPLATTERED style bonus.
Punching V2 in 4-4: Clair de Soleil with the Knuckleblaster will enrage it. Punching a Gutterman with a knuckleblaster will destroy its shield. Knuckleblaster's shockwave also works.

Killing Drones, Virtues or the Mysterious Druid Knight (& Owl) with a punch will give the + HOMERUN style bonus.
Punching dying Mindflayer with knuckleblaster will launch her in direction of the punch, killing enemies in such way will give +STRIKE! style bonus.

WHIPLASH
Primary Fire
Damage	0.2
Cooldown	~0s (Exhaust)
Alternate Fire
None
Damage Modifiers
None
Terminal Info
A winch with a spear. Hold to throw, release to pull. Can pull light enemies and items, will get pulled to heavy enemies and Hookpoints.
Obtained in
4-4: CLAIR DE SOLEIL

WHIPLASH

The Whiplash is the third arm the player obtains, dropped by V2 after its death in 4-4: Clair de Soleil. It's a green arm, multi-jointed arm with a spear on the tip of the hand.

The default key to use the Whiplash is R. When used, it will throw out a hook that deals 0.2 damage and retracts after a short time. This hook will either snatch Light enemies and hurl them towards the player or pull the player towards Medium/Heavy enemies and Whiplash Hookpoints.
Holding down its keybind will make the hook travel for a longer amount of time before retracting, or will stop the player from grappling onto any enemies and Whiplash Hookpoints that it is attached onto.
The Whiplash can also snatch the Rocket Launcher's Rockets.
Punching with either the Feedbacker or the Knuckleblaster will cancel the Whiplash's snatch or grapple, however snatched enemies and players who have grappled onto a Medium/Heavy enemy or Whiplash Hookpoint will retain the Whiplash's momentum.

Stalkers will take no damage from the Whiplash's hook, however they can still be grappled onto.
The Hideous Mass's and the Leviathan's armour will make the Whiplash's hook bounce away from it.
Coins will have their momentum reset and be bounced upwards when hit with the Whiplash's hook.
Corpses of Malicious Face and Gutterman can be grappled onto with the Whiplash's hook.
Dying Mindflayer can be snatched, which will also slightly increase time before Mindflayer blows up.