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Killing Floor 3 (KF3)
Best Bonus Abilities
★ Disclaimer: Our guides were written before the Rearmament update, so some information may be outdated. We appreciate your support!
★ News: Crossplay | Game Pass | Roadmap
★ Best Settings | Teams | Weapons
┗ Best Bonus Abilities | XP Farm | Difficulty
The best bonus abilities for weapon mods have superior effects, such as increased boss damage and team healing in Killing Floor 3 (KF3). See the overall best bonus abilities overall and the best bonus abilities for each class here!
| Check Out Our Best Pages! | |||||
|---|---|---|---|---|---|
| Best Builds | Best Weapons | Best Tools | |||
| Best Leveling | Best Classes | Best Team | |||
| Best Skills | Best Bonus Abilities | Best Ammo and Weapon Mods | |||
Overall Best Bonus Abilities
| Name | Bonus Effects and Priority |
|---|---|
| Boss Basher | Increased Damage Against Bosses ★★★★★ |
| Killshot Cure | Heal Teammates With ZED Kills ★★★★☆ |
| Stumblesome | Stumble Power Boost ★★★☆☆ |
Boss Basher
| Bonus Ability and Priority | Type |
|---|---|
| Deal 5% more damage to Bosses. ★★★★★ |
Universal |
The best general bonus ability for winning games more easily is the 5% damage boost against bosses. Bosses have massive health pools, especially at higher difficulties, so this bonus helps take them down faster. It’s a universal ability that works with any Weapon Mod and Character.
Boss Basher Mod Slots and Best Classes
Killshot Cure
| Bonus Ability and Priority | Type |
|---|---|
| Teammates with the lowest Health within 10m gains 1 Health after killing an enemy. ★★★★☆ |
Universal |
Healing your lowest-health teammate is a great way to keep the frontline alive, especially when you're mowing down large groups of trash ZEDs each wave. This allows you to passively support frontliners like the Ninja and conserve team heals.
Killshot Cure Mod Slots and Best Classes
Stumblesome
| Bonus Ability and Priority | Type |
|---|---|
| Add 20 Stumble Power. ★★★☆☆ |
Universal |
Stumble is an excellent affliction to apply to the ZED hordes as this effectively slows them down, giving you more time to dispatch of them before they get too close. Stumbling them can also interrupt their dangerous attacks.
Stumblesome Mod Slots and Best Classes
Best Bonus Abilities for Each Class
| Jump to a Class! | ||
|---|---|---|
 Commando |
 Firebug |
 Engineer |
 Sharpshooter |
 Ninja |
 Medic |
Commando Best Bonus Abilities
| Name | Bonus Ability and Priority |
|---|---|
| Critical Strikes | Each shot has a 1.5% chance to deal 150% Damage. ★★★★★ |
| Deadlier Zed Time | Teammates within 10m deal 2.5% bonus weapon Damage during Zed Time. ★★★☆☆ |
The highest priority bonus to aim for is the 1.5% chance to deal 150% extra damage with each shot. Commando's high rate of fire and large magazine sizes make this effect trigger frequently. The bonus damage is especially valuable against high-level ZEDs and bosses.
Commando also has a strong passive skill for building up ZED Time, so boosting your team's damage during it helps clear waves faster and adds strong teamplay value.
Best Commando (Foster) Builds and Skills
Firebug Best Bonus Abilities
| Name | Bonus Ability and Priority |
|---|---|
| Killshot Cure | Teammates with the lowest Health within 10m gains 1 Health after killing an enemy. ★★★★★ |
| Panic Attack | Add 10 Panic Power. ★★★☆☆ |
For the Firebug to provide team support, healing the lowest-health teammates is incredibly valuable, especially for keeping your frontliners alive. Since the Firebug clears fodder ZEDs quickly, those 1 HP heals add up fast.
Adding extra Panic power to your fire is also helpful, keeping ZEDs staggered or at bay longer before they’re taken down.
Best Firebug (Devlin) Builds and Skills
Engineer Best Bonus Abilities
| Name | Bonus Ability and Priority |
|---|---|
| Ammo Efficiency | Increases Damage by 7 when magazine is at or below 1/4 capacity. ★★★★★ |
| Critical Exposure | Next round deals 10 additional damage after destroying an enemy's limb or armor. ★★★★☆ |
These bonus abilities are ideal for the Engineer’s shotguns and explosives, which have low magazine sizes and can destroy enemy limbs with little effort. The Engineer can take full advantage of the bonus damage, amplifying their DPS even further.
Best Engineer (Imran) Builds and Skills
Sharpshooter Best Bonus Abilities
| Name | Bonus Ability and Priority |
|---|---|
| First Strike | Increases Damage by 35 from the first shot with a fully-loaded magazine. ★★★★★ |
| Deadly Resupply | 33% chance to return 1 round to the magazine on killshot. ★★★☆☆ |
The Sharpshooter excels at high damage per shot, and gaining a supercharged first shot makes them even more effective at taking down medium and large ZEDs. Their perk weapons typically have low magazine sizes, allowing these effects to trigger more frequently.
To further help the low magazine size, a 33% chance to refill a round on kill is a huge advantage for the Sharpshooter. Perk rifles can one-shot most low and mid-tier ZEDs, and every round delivers significant damage.
Best Sharpshooter (Luna) Builds and Skills
Ninja Best Bonus Abilities
| Name | Bonus Ability and Priority |
|---|---|
| Melee Master | Deal 2.5% more Melee Damage and 20% more Bash Damage. ★★★★★ |
| Boss Basher | Deal 5% more damage to Bosses. ★★★☆ |
Boosted melee damage is an obvious choice for the Ninja, helping you take down big ZEDs more quickly. It's also worth adding the 5% bonus damage to bosses on your ranged weapons to help finish boss fights faster, especially since you'll be drawing most of the aggro.
Best Ninja (Nakata) Builds and Skills
Medic Best Bonus Abilities
| Name | Bonus Ability and Priority |
|---|---|
| Critical Strikes | Each shot has a 1.5% chance to deal 150% Damage. ★★★★★ |
| Armored Allies | Teammates within 10m have a 5% chance to gain 5 Armor after killing an enemy. ★★★☆☆ |
The Medic’s high rate-of-fire SMGs are perfect for pairing with the 1.5% chance to deal 150% damage per shot. This boosts your overall DPS and helps trigger the Chemical Reaction passive more frequently.
For added support, equipping a bonus that gives teammates a chance to gain armor makes you even more valuable, as you’re not only healing their HP but also improving their survivability with armor repairs.
Best Medic (Obi) Builds and Skills
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