Hoarder triggers a Loud Noise Notification for 4 seconds, whenever a Survivor performs any of the following actions within 32/48/64 meters of your location:

Unlocks a Chest.
Picks up any Item, including Limited Items.
Hoarder spawns 2 additional chests in the Trial.

At the start of the Trial, 4 random Hooks are changed into Scourge Hooks:

The Auras of Scourge Hooks are revealed to you in white.
Each time a Survivor is unhooked from a Scourge Hook, the following effects apply:

The Survivor suffers from the Hemorrhage and Mangled Status Effects until healed.
Upon being healed, the Survivor suffers from a 10/13/16 percent Action Speed penalty to Healing and Repairing until they are injured again.

Survivors within your Terror Radius have a 50percent penalty to healing progression speed, and healing Skill Checks move 50percent faster.

Performing the Damage Generator Action on a Generator activates Oppression:

Causes up to 3 additional Generators to also start regressing.
Triggers a difficult Skill Check on all Survivors currently repairing one of those Generators.
Oppression has a cool-down of 120/100/80 seconds.