Failing a Skill Check while repairing:

Prevents the Generator Explosion.
Applies the default Regression penalty.
Applies an additional Regression penalty of 5/4/3 percent.
Technician reduces the audible range of your Generator-repairing noises by 8 metres.

Once the Exit Gates are powered, No One Left Behind activates:

Increases your Unhooking and Healing speed by 30/40/50 percent.
Grants 50/75/100 percent bonus Bloodpoints for actions in the Altruism Category.
Grants the unhooked Survivor a 7 percent Haste Status Effect for 10 seconds.
The Auras of all other Survivors are revealed to you.

After repairing Generators for a total of 50 percent, Blast Mine activates:

After repairing a Generator for at least 3 seconds, press the Active Ability button to install a Trap, which stays active for 40/45/50 seconds.
The Aura of Trapped Generators are revealed in yellow to all Survivors.
When the Killer damages a Trapped Generator, the Trap explodes, stunning them and blinding anyone nearby.
Blast Mine deactivates after triggering successfully or if the timer runs out.

After a successful Killer Blind, the Killer suffers from the Blindness Status Effect for 20/25/30 seconds.
Residual Manifest grants the ability to rummage through an opened Chest once per Trial and will guarantee a basic Flashlight.

You start the Trial with 1/2/3 Token(s) and gain a Token each time you succeed at a Great Skill Check, up to a maximum of 5 Tokens.

Each time another Survivor cooperating with you fails a Skill Check, Corrective Action consumes 1 Token, transforming their Failed Skill Check into Good Skill Check instead.
Corrective Action only applies to normal Skill Checks.

Whenever you become injured, you retain the Movement Speed burst for 2 additional seconds.
Overcome causes the Exhausted Status Effect for 60/50/40 seconds.
Overcome cannot be used when Exhausted.