The Player can equip up to two Add-ons for an Item (Survivor) or a Power (Killer).
For Killers, Add-ons are single-use only and are lost after a Trial ends. However, they can be retained by burning a Template:IconLink Offering.
For Survivors, whether or not they lose their Add-ons or get to keep them depends on the situation:
You keep the Add-ons under the following conditions:
Burning a Template:IconLink Offering.
Escaping the Trial with the Item you have the Add-ons equipped on.
You lose the Add-ons under the following conditions:
Dying during the Trial.
Disconnecting from the Trial.
Losing/Using up the Item you the have the Add-ons equipped on during the Trial.
Add-ons are bound to the Survivor's Item, so if you pick up another Survivor's Item, you will also receive the Add-ons equipped on that Item (needed for the Vulture achievement).
Add-on Series
Main article: Add-on Series
Killers tend to have Add-on Series, several Add-ons with similar effects, that increase in effectiveness and power the higher their Rarity class is.
Add-ons from Chests
Using the Perk Template:IconLink, a Survivor will find Template:IconLink with Add-ons attached to them.
Stacking
Add-ons that affect the same part of Power will stack with one another unless they explicitly state otherwise.
The Bear Trap is The Trapper's main Power and also his secondary weapon: Bear Traps are found lying around the map. They can be picked up and set down mostly anywhere. Traps are not armed until picked up and placed. The Trapper starts the game with a single trap in his hands, and can only carry one at once unless using Add-ons.
The Blackened Catalyst is The Hag's main Power: she bends and shapes mud to her will. With simple ritualistic drawings, she creates deceitful duplicates of herself made from mud and decay which she can use for various effects.
"Source of The Hag's power, a blackened finger used as a catalyst for her terrible power."
Bubba's Chainsaw is The Cannibal's main Power and also his secondary weapon: it shares a lot of the Chainsaw's abilities and Add-ons. The Cannibal can charge it up to break into a crazed sprint, wildly swinging his Chainsaw around, putting any Survivor unlucky enough to come in contact with it into the Dying State. Can hit multiple targets on a single charge.
Carter's Spark is The Doctor's main Power: The Entity has ignited a corrupted and inexhaustible spark in the Doctor's heart which allows him to generate electro-convulsive power at will.
His insidious treatment corrupts the minds of those it touches. Victims shocked by the corrupt spark begin to lose their grip on reality and, with repeated exposure, inevitably succumb to madness.
The Chainsaw is The Hillbilly's main Power and also his secondary weapon: Once revved up, sends its user into a violent frenzy, running at high speed across the map. The noise can be heard across the whole map, similar to the Wraith's Wailing Bell. It too can be muffled with Add-ons.
"A hulking and deadly chainsaw of terrifying strength. Grinds through flesh, bone and soul."
Feral Frenzy is The Legion's main Power: activating it will put The Legion into a frenzy, considerably increasing their movement speed for a limited time. Successful attacks can be chained between Survivors and apply the Template:IconLinkStatus Effect, putting them into a bleed-out timer.
Hunting Hatchets are The Huntress' main Power and also her secondary weapons: charging up her Hatchets allows her to throw them at great speed at fleeing Survivors or use it as a ranged weapon to snipe Survivors from afar.
"A skill taught by her mother and mastered in the wild. The Huntress can throw Hatchets with deadly precision."
Jigsaw's Baptism is The Pig's primary Power. It allows her to put Reverse Bear Traps onto dying Survivors, that will instantly sacrifice them once they trigger. She can ambush Survivors by crouching towards them and then dash forward.
""You will give everything to me, every cell in your body. The marks on your arms, they're from another life. We'll leave that life behind. When you walk down that corridor there is no turning back. Do you understand that?" — Jigsaw's Baptism
Spencer's Last Breath is The Nurse's main Power: channelling its energy allows The Nurse to pierce and jump through the Spirit World in a Blink multiple times in a row. Doing so leaves her in a state of fatigue.
"A powerful and violent last breath snatched from Crotus Prenn Asylum warden Patrick Spencer."
The Afterpiece Tonic is The Clown's main Power: throwing a bottle will release a cloud of intoxicating smoke once it breaks. Survivors passing through the cloud will be affected with blurred vision, slower movement speed and coughing fits, amongst various other afflictions based on the chosen Add-ons.
The Wailing Bell is The Wraith's main Power: the Wailing Bell holds ancient powers, both with good and bad consequences. It allows its user to enter and walk the Spirit World when rung. When cloaked, The Wraith has no Terror Radius, meaning that Survivors do not hear a heartbeat, and The Wraith's Stain is also gone. The Wraith walks moderately faster when cloaked, making up for his inability to interact while in this state. The sound of the Bell is very loud, but can only be heard at a close distance to The Wraith. The accompanying *wooosh* sound, indicating a full uncloak or cloak, is heard by those within 40 metres of range. The volume of the Bell can be reduced with Add-ons.
"A heavy cast iron bell imbued with ancient powers."
The Flashlight is an Item that is used to blind the Killer. If they are carrying a Survivor on their shoulder, getting blinded will make them drop that Survivor and be stunned for a few seconds.
The Flashlight is also very effective against three Killers, The Hag, The Wraith and The Nurse.
"Most of the battery life was wastefully used by the previous owner."
The Key is an Item that can be used to open the Hatch when it spawns. It can also be used with Add-ons to enhance its power and show the user different Auras, such as those of other Survivors in their vicinity or that of the Killer. The Broken Key cannot be used to open the Hatch and is of no use without Add-ons.
The Map is an Item that is used to track and mark props in the World. The standard map can only track Generators, but can track different props as well with the use of Add-ons
that enhance its power. You can even make the tracked Auras visible to other Survivors and create markers that look like a pillar of bright light.
The Med-Kit is an Item that is used to heal yourself and other Survivors. Other Survivors can also be healed without the use of a Med-Kit, but it takes considerably longer.
Without the use of Self-Care, a Survivor cannot heal themselves without one. Different Add-ons can be equipped that enhance its healing speed or durability.
The Toolbox is an Item that can be used to repair Generators more quickly or sabotage hooks. Different Toolboxes have different uses and not all of them are good for both uses. Add-ons can be equipped to enhance their speed and durability.
"It is unclear as to where these tools come from. Were they brought in by one of us or did they belong to one of the monsters?"
Template:Add-ons: Toolbox
Decommissioned Add-ons
These Add-ons have been replaced with new Add-ons during an Add-on Pass and are no longer in use.
Template:Add-ons: Decommissioned
Unused Add-ons
These Add-ons are found in the game-files but are not used in-game.
Template:Add-ons: Unused