After a Survivor loses a health state, Gearhead activates.

While Gearhead is active, the next time a Survivor completes a Great Skill Check while repairing, the perk deactivates and their aura is revealed to you for 10 seconds.

Your base Terror Radius is increased by 8 meters.

Whenever you are outside of a Chase, your Terror Radius is reduced by 16 metres while your Field of View is increased by 3/5/10 °.
Field of View gains do not stack.

When carrying a Survivor, Starstruck activates:

Survivors suffer from the Exposed Status Effect while in your Terror Radius.
The Status Effect lingers for 26/28/30 seconds after leaving your Terror Radius.
After hooking or dropping the carried Survivor, Starstruck deactivates:

The Status Effect persists for 26/28/30 seconds for any Survivor inside your Terror Radius at that moment.
Starstruck has a cool-down of 60 seconds once the Survivor is no longer being carried.

As soon as an exit gate is opened, Blood Warden is activated.  The auras of any Survivors located within Exit areas are revealed to you.  Once per match, hooking a Survivor while Blood Warden is active calls upon The Entity to block both Exits for all Survivors for 60 seconds.