Stridor

Stridor is a teachable Unique Nurse Perk . It can be unlocked for all other Characters from Level 30 onwards:

Perk descriptions may vary from in-game descriptions for reasons explained here.
Perks support Mouse-over functionality (desktop version only): hovering over the modifier words with your cursor will reveal the values behind them.
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Icon	Tier I	Tier II	Tier III	Description
	4,000	5,000	6,000	You are acutely sensitive to the breathing of your prey. Survivors' Grunts of Pain are 25/50/50 % louder and regular breathing is 0/0/25 % louder. "If you don't stop and catch your breath... she will."

Icon	Teachable	Description
	5,000	Unlocking this Perk makes it available in the Bloodweb of all Killers You are acutely sensitive to the breathing of your prey. Survivors' Grunts of Pain are several percent louder and regular breathing is 0/0/25 % louder. "If you don't stop and catch your breath... she will." May be unlocked in the Shrine of Secrets or in The Nurse's Bloodweb at Level 30.

Breathing Volumes

The percentages on both Stridor and its Survivor-pendant Iron Will are misleading in their interaction with one another, as contrary to the popular perception of percentages, they do not represent actual percentages in the Game code, but rather numeric values that are combined additively.

A good analogy is a volume slider ranging from 0 to 100, which can also go above 100 if necessary.

• Positive values move the volume slider upwards, increasing the volume.
• Negative values move the volume slider downwards, lowering the volume.

Grunts of Pain

Volume settings

	No Stridor	Stridor I (+25)	Stridor II & III (+50)
No Iron Will	100	125	150
Iron Will I (-50)	50	75	100
Iron Will II (-75)	25	50	75
Iron Will III (-100)	0	25	50

Regular Breathing

Volume settings

Stridor I (+0)	Stridor II (+0)	Stridor III (+25)
100	100	125

Trivia

• The term "Stridor" describes a high-pitched wheezing sound caused by disrupted airflow, which is also what The Nurse suffers from.