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Pheromones are an aura-based buff available to the Drone, Hivelord, Carrier, Praetorian and Queen. There are three types of pheromones, Recovery, Warding and Frenzy, with effects and range varying based on caste emitting them. If two castes in range are emitting the same pheromone, the stronger pheromone will override the weaker one (With the exception of Frenzy, Which stacks but only for the slash damage). If they are emitting different pheromones, both will be applied.
Pheromones require a steady amount of plasma to sustain, although all castes that have access to them usually have comfortable plasma reserves. It should be noted however that they will seriously dent plasma regeneration if used frivolously and should be turned off if not needed. It also costs a bit of plasma to start emitting pheromones. If you run out of plasma, you will immediately stop emitting pheromones.
Your pheromones will stop emitting if you end up falling into critical health with them emitting, but you will still be affected by pheromones from other conscious xenomorphs.
Note that same type pheromones do not stack but varied ones do. e.g. Recovery and Warding.
List of Pheromones
| Pheromone | Effect |
|---|---|
 Recovery |
Increases health regeneration, increases plasma regeneration on weeds, reduces stun times of affected Xenomorphs. |
 Warding |
Increases the needed critical damage for Xenos to die, and the damage taken by being in critical condition. Potent enough warding pheromones will completely negate bleed out. |
 Frenzy |
Increases movement speed and damage from slashes. Slash damage may stack however the movement speed does not. |
Pheromones Tactics
- The more powerful the caste emitting is, the stronger the effect. There is an obvious difference between the pheromones of a Drone and the pheromones of the Queen. A well placed high level pheromone can allow Xenomorphs to unlock their full potential in a specific area.
- Pheromones emitted by a stationary Queen are additionally applied through all Xeno Leaders in existence. These can be located by the star on their XenoHUD Status. They will emit identically to a Queen overwatch, and stack with any other pheromones emitted by the leader.
- A common pheromone duo is the Queen with a Praetorian emitting Frenzy and Recovery, with Warding left to the next best caste. This allows the Xenos to be faster and hit harder as well as being able to recover their wounded very fast, making for better odds in large, messy stand-offs.
- Reducing or negating critical bleedout might sound like a lame effect, but it can actually be critical in big battles. A Xeno shot into critical has a life expectancy numbered in seconds, but a strong enough Warding pheromone can make it infinite as long as they don't take further damage, making it trivial to drag them to weeds to let them recover.
- Recovery pheromones will usually not grant more plasma than they take away to maintain. Of course, this is offset by the fact that all castes around you get said plasma for free, and that everyone gets extra health regeneration if damaged.
- It is actually perfectly debatable what pheromone is best if you are alone, but they are all useful. Frenzy makes you move faster and gives you a good desperation attack if ambushed. Recovery allows you to recover faster from stun sources like explosions or electrified gear, allows you to heal if tracked down and pays for itself partly. Probably the worst choice is simply no pheromones.