Siren (Killing Floor 2)

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The Siren in Killing Floor 2

General Information

The Siren is an uncommon specimen in Killing Floor 2. It is classified as a medium enemy.
Sirens appear as anorexic and skeletal females, lacking eyes and features. They also wear a metallic harness over their body, which serves as a crude bulletproof vest. Most distinctively, they have a sonic amplifier device embedded in their throats, allowing them to unleash bone-chilling screeches that damages and visually disorients players within range.

Statistics

	Normal	Hard	Suicidal	Hell on earth
Bounty	£28	£25	£21	£16
XP	11	15	15	15
Base Health (Body)	172	230	276	299
Base Health (Head)	116	155	155	170

Notes on XP

• XP rewarded for your on-perk weapons.
• Killing with weapons other than your current perk grants the XP to the perk that weapons belongs to.
• Damaging with on-perk weapons and then finishing it off with an off-perk weapon divides the XP and grants it to both perks.
• Damaging with off-perk weapons and then finishing it off with an on-perk weapon divides the XP and grants it to both perks.
• Assist kills grants full XP.
• The bash attack (default v) does not count as Berserker damage for Berserker XP, meaning it grants the XP to your current perk.

Speed

- Sirens never sprint, they are only able to walk.
- Movement speed is randomized, but is skewed towards higher values as difficulty increases.
- Movement speed is further modified by a multiplier based on difficulty. This value is 0.87 on Normal, and 1.05 on Hell On Earth.
- Movement speed is set to maximum at all times on Hell on Earth difficulty.

	Normal	Hard	Suicidal	Hell on earth
Speed (Walking)	180 - 220	180 - 220	180 - 220	180 - 220
Speed (Enraged)	180 - 220	180 - 220	180 - 220	180 - 220
Chance to Rage on Sight	0%	0%	0%	0%
Chance to Rage when Shot	0%	0%	5%	10%

• For comparison, a healthy player character with minimal weight walks at a speed of 383, and sprints at a speed of 460.
  
• These values can be modified by various perk level benefits, and skills.
  

Resistances

- Sirens have a wide range of resistances, and no weaknesses.

	Piercing	Slashing	Bludgeon	Toxic	Fire	Microwave	Explosives
Damage Taken Multipler	50%	100%	100%	25%	50%	85%	85%

- Sirens have no ballistic weaponry resistances, but interestingly, have one special weakness to the Double-Barreled Shotgun.

	Sub-machine Gun	Assault Rifle	Shotgun	Handgun	Rifle	Shotgun - DBS
Ballistic Damage Multiplier	100%	100%	100%	100%	100%	110%

- Sirens have 2 weak spots, which are the head and the neck.
- Sirens wear a metallic plating over their bodies, which reduces the damage when they are shot in the chest and hips, acting as a crude bullet-proof vest.
- Note that damaging them in the neck is not the same as damaging the head; Damaging the neck will subtract from the body health, not the head health.

	Hit Zone Damage Factor
Head	110%
Neck	110%
Chest	50%
Hips	50%
All other	100%

Behavior

- The Siren is a glass cannon. It is a slow-moving, area of effect damage Zed.
- Upon spawning, it will walk towards the nearest player. Upon getting close to a target, they will begin to attack by screaming.
- Sirens cannot sprint.
- Siren screams deal massive damage which increases based on how close they are to the player.
- Siren screams ignore armor.
- Siren screams will stack with other Sirens and deal damage separately.
- Siren screams visually distort the area around them and cause players' screens to shake violently depending on how close they are to players.
- Siren screams destroy grenades and explosives (including C4 that has been placed on the ground), unless used by a Demolitionist with the Siren Resistance skill.
- After screaming, the Siren has a short cooldown time before it can scream again.
- If a player is standing right in melee range of a Siren, it will attempt to scratch or bite instead of scream, though sometimes it will scream regardless.

- On Suicidal and Hell On Earth, Sirens do not gain any additional abilities.

Extermination Tactics

- The Siren is deceptively durable despite its lanky build and looks. This is largely due to the metallic harness that they wear over their bodies which absorb damage.
- Sirens are extremely dangerous specimens and are capable of killing entire teams quickly when too many of them are left alive to scream in melee range.
- Sirens move very slowly, and therefore should be taken care of from a distance long before they have a chance to scream.
- The presence of Sirens also disables the use of explosives, which can prove deadly when a horde of Zeds are traveling with Sirens in the pack, who can scream to prevent explosives from easily taking out a group of Zeds.
- Sirens can be easily killed by perks that use high powered ballistic weaponry from a distance. Namely, the Commando and the Sharpshooter, who both excel at killing Sirens from a long distance safely.
- The Support Specialist can take out Sirens relatively well at medium to close range, but they risk taking damage from screams. However, one shotgun blast to the head usually decapitates them instantly. Interestingly, the game encourages Support Specialists to get up close and personal with the Siren, especially with the Double Barreled Shotgun's increased damage multiplier, to kill them.
- The Berserker has no choice but to tank the scream if they are engaging Sirens. However, one well-placed strong attack to the head usually kills them instantly as well, stopping the scream immediately. Berserkers can also wait for the cooldown between Screams to attack.
- The Demolitionist can exterminate Sirens the quickest with their powerful explosive weapons that do not require perfect aim. Once a Demolitionist acquires the Siren Resistance skill, they can quickly and reliably dispatch even groups of Sirens with their high powered explosive weapons. Before then, try to only shoot at Sirens in between their screams.
- When faced with groups of Sirens, it is often wiser to clear a path and back off so you can kill the Sirens safely from a distance, rather than risk getting surrounded by Sirens in every direction. A wipe is almost guaranteed if there are multiple Sirens screaming at the same time among the team, as the damage done by multiple Sirens stack.