Each time a Survivor other than yourself is killed or sacrificed, Sole Survivor gains 1 Token, up to a maximum of 3 Tokens:

Each Token grants a stack-able radius of 20/22/24 metres within which the Killer is unable to read your Aura, up to a maximum of 60/66/72 metres.
Once you are the last Survivor standing, you benefit from the following effects:

Increases your Repair speed of Generators by +75 percent.
Increases your Opening speed of the Exit Gates and the Hatch by +50 percent.
Increases the odds of becoming the Killers initial Obsession by +100 percent.

The Killer can only be obsessed with Survivor at a time.

Once per Trial, you can completely recover from the Dying State.

Your Recovery speed is increased by 25/30/35 percent.

After being healed from or having recovered from the Dying State, Soul Guard grants you the Endurance Status Effect for the next 4/6/8 seconds.

Any damage taken that would put you into the Dying State will instead trigger the Deep Wound Status Effect, after which you have 20 seconds to Mend yourself.
Taking any damage while under the effect of Deep Wound or if its timer runs out will put you into the Dying State.
Soul Guard allows you to completely recover from the Dying State when you are affected by the Cursed Status Effect.
Soul Guard has a cool-down of 30 seconds.

While repairing Generators, complete 5/4/3 Good or Great Skill Checks to activate Rookie Spirit for the remainder of the Trial:

Once active, the Auras of any regressing Generators are revealed to you.