When retrieving an Item from a Chest, there is a chance an Add-on will be attached to it.

100 percent chance for an Add-on of Very Rare Rarity or lower.
10/25/50 percent chance for a second Add-on of Uncommon Rarity or lower.
Ace in the Hole allows you to keep any Add-ons your Item has equipped upon escaping.

In your countless years in The Fog, you have seen it all, and when you are focused, you can remember most of it too. Succeeding a Great Skill Check while repairing a Generator reveals the Killers Aura to you for 4/5/6 seconds.

Unlocks potential in your Aura-reading ability.
Once all Generators are completed, Wake Up! activates:

The Auras of the Exit Gate Switches are revealed to you within 128 metres.
When opening an Exit Gate, your Aura is revealed to all other Survivors within 128 metres.
You open Exit Gates 15/20/25 percent faster.

Unlocks potential in your Aura-reading ability:
For the duration of the Killer carrying another Survivor, you see the Aura of every Hook within 56 metres of the pick-up location:

The Auras of regular Hooks are revealed to you in white.
The Auras of Scourge Hooks are revealed to you in yellow.
Unlocks the ability to sabotage Hooks without needing a Toolbox.

Sabotaging a Hook without a Toolbox takes 2.5 seconds.
The Sabotage action has a cool-down of 90/75/60 seconds.