IO Enhancement Sets Reference Guide

Note: Sets marked ⭐ are widely considered best-in-slot or highly recommended for most builds. Sets marked 🔴 are rare/expensive. ATOs = Archetype-specific sets. Superior versions are level 50 upgrades of ATO sets.

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How IO Sets Work

• Slot 2–6 IOs from the same set into a single power to earn set bonuses
• Set bonuses are global — they apply to your character at all times regardless of whether the power is used
• Enhancement Diversification (ED): Diminishing returns kick in past ~95% enhancement in a single stat — diversify your slotting
• Law of Fives: You can only benefit from 5 copies of any single set bonus across your entire build
• Attuned IOs level up with you and never go grey — recommended for most slots
• Superior ATOs are the best-in-slot versions but cannot be attuned

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IO Set Categories

Sets are organized by the power type they can be slotted into. A set can only go in powers of its matching type.

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🗡️ Melee Damage Sets

Powers that deal direct melee damage.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Kinetic Combat	35–50	4	⭐ Smashing/Lethal defense bonus at 4-piece. Very popular on melee builds chasing S/L defense softcap.
Crushing Impact	20–50	6	Solid all-around acc/dam/end/rech set. Good budget melee choice.
Mako's Bite	20–50	6	Ranged defense bonus at 6-piece. Good for melee characters wanting ranged def.
Hecatomb	50	6	🔴 Rare set. Massive fire/cold resistance at 3-piece. Top-end melee DPS set.
Titans' Revenge	—	6	🔴 ATOs for Scrapper. Superior version gives Build Up proc.
Touch of Death	20–50	6	Negative energy/toxic resistance bonuses. Decent budget option.
Gladiator's Strike	50	6	🔴 Includes the +3% defense unique (Gladiator's Armor is the defense version).
Superior Scrapper's Strike	50	6	🔴 Scrapper ATO. Proc gives Build Up on critical hit.
Superior Brute's Fury	50	6	🔴 Brute ATO. Proc interacts with Fury mechanic.
Superior Stalker's Guile	50	6	🔴 Stalker ATO. Proc activates on Assassin's Strike.
Superior Tanker's Guarantee	50	6	🔴 Tanker ATO.

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🏹 Ranged Damage Sets

Powers that deal damage at range (single target).

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Thunderstrike	21–50	6	⭐ Ranged defense bonus. Most popular ranged set for defense-building.
Decimation	20–50	6	⭐ Recharge bonus at 4-piece. Includes the Chance for Build Up proc — fires on every ranged attack use.
Entropic Chaos	10–20	6	Budget ranged set for leveling.
Apocalypse	50	6	🔴 Rare. Top-end ranged set. Strong proc and resistance bonuses.
Devastation	20–50	6	HP/regen bonuses. Good if chasing max HP build.
Defender's Bastion	50	6	🔴 Defender/Corruptor ATO. Proc provides a team defense buff.
Superior Defender's Bastion	50	6	🔴 Enhanced version.
Blaster's Wrath	50	6	🔴 Blaster ATO. Proc adds damage boost.
Superior Blaster's Wrath	50	6	🔴 Enhanced version.

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💥 PBAoE Damage Sets

Point-blank area of effect damage powers (affects enemies around you).

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Armageddon	50	6	🔴 Rare. The premier PBAoE set. Fire/cold resistance at 3-piece. Chance for Fire Damage proc is excellent.
Obliteration	20–50	6	⭐ Melee defense bonus at 4–5 piece. Great budget PBAoE set. Very commonly used.
Multi-Strike	20–50	6	Decent all-around set. Cheaper alternative.
Eradication	10–50	6	Energy defense bonus at 4-piece. Good for energy-heavy content.
Scirocco's Dervish	10–50	6	AoE defense bonus. Budget AoE option.

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🎯 Targeted AoE Damage Sets

AoE attacks targeted on a location or specific enemy.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Ragnarok	50	6	🔴 Rare. Fire/cold resistance at 3-piece. Chance for Knockdown proc is widely used.
Positron's Blast	10–50	6	⭐ Fire/cold resistance at 3-piece. Very popular budget targeted AoE set.
Bombardment	10–50	6	AoE defense bonus. Solid all-around set.
Javelin Volley	10–50	6	Ranged defense bonus. Good alternative to Positron's.
Air Burst	10–50	6	Knockback-based set. Less commonly used.
Pounding Slugfest	10–20	6	Budget leveling set.

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🏹 Sniper Attack Sets

Long-range sniper powers.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Sting of the Manticore	20–50	6	⭐ Ranged defense bonus. The go-to sniper set.
Executioner's Contract	20–50	6	Cold resistance bonus. Good secondary sniper option.
Calibrated Accuracy	10–20	6	Budget leveling sniper set.

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🛡️ Defense Sets

Powers that grant defense bonuses (toggles/clicks that improve your defense stat).

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Luck of the Gambler	10–50	6	⭐⭐ The most important IO in the game. The +7.5% Global Recharge piece slots into any defense power. Stack 4–6 of these across your build.
Red Fortune	10–50	6	Ranged defense bonus. Cheap filler set for defense toggles.
Kismet	10–50	6	Includes the +6% ToHit global unique — one per build, slot in a cheap toggle like Combat Jumping.
Gift of the Ancients	10–50	6	Fire resistance and run speed bonuses. Decent secondary set.
Shield Wall	50	5	🔴 Rare. Includes the +5% Resistance unique — global resist bonus. Expensive but powerful.
Reactive Defenses	20–50	6	⭐ Includes the Scaling Resist Damage unique — resistance scales up as your HP drops. Excellent clutch survival tool.
Steadfast Protection	30–50	6	⭐ Includes the +3% Defense global unique. One per build. Slot in Tough.
Gladiator's Armor	50	6	🔴 Includes the +3% Defense global unique (different from Steadfast — both can be slotted in the same power for +6% total).

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🛡️ Resistance Sets

Powers that grant damage resistance.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Unbreakable Guard	10–50	6	⭐ +max HP bonus at 3-piece. Very popular for Tough slotting to maximize HP pool.
Aegis	10–50	6	Psionic/status resistance bonuses. Good for builds concerned about psi damage.
Impervious Skin	10–50	6	Status effect resistance bonuses.
Titanium Coating	10–50	6	Recharge bonus at 2-piece. Inexpensive.
Resist Damage	—	—	Common IO — not a set, but used for single-slot resist enhancement.

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💚 Healing Sets

Powers that heal HP.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Panacea	10–50	6	⭐ Includes the +HP/+End proc — passive HP and endurance recovery. Slot in Health.
Numina's Convalescence	10–50	6	⭐ Includes the +Regeneration/+Recovery global unique. Slot in Health alongside Panacea.
Miracle	10–50	6	Includes the +Recovery unique — passive endurance recovery boost.
Doctored Wounds	10–50	6	Recharge bonus at 4-piece. Popular for heal powers needing fast recharge (e.g., Twilight Grasp).
Touch of the Nictus	20–50	6	Includes a Chance for Negative Energy Damage proc. Often used in heal/drain powers.
Theft of Essence	20–50	6	Includes a Chance for +End proc — fires when healing, restoring endurance. Very popular in heal sets.
Preventive Medicine	10–50	6	Includes a Chance for +Absorb proc — gives a damage shield when HP drops below 50%.

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⚡ Endurance Modification Sets

Powers that drain, boost, or manipulate endurance.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Performance Shifter	10–50	6	⭐ Includes the Chance for +End proc — passive endurance restoration. Slot in Stamina.
Efficacy Adaptor	10–50	6	Recharge bonus. Decent secondary endurance set.
Power Transfer	10–50	6	Includes a Chance to Heal Self proc.

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🔒 Hold Sets

Powers that hold (mez) a target.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Unbreakable Constraint	50	6	🔴 Rare. Fire/cold resistance at 3-piece. Chance for Smashing Damage proc.
Basilisk's Gaze	20–50	6	⭐ Ranged defense bonus at 4-piece. Very popular for holds.
Lockdown	20–50	6	⭐ Includes the +2 Mag Hold proc — allows holding bosses (Mag 3). Slot in any hold power.
Neuronic Shutdown	20–50	6	AoE defense bonus. Alternative hold set.
Fortunata Hypnosis	20–50	6	Psionic resistance bonus.

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🌀 Immobilize Sets

Powers that immobilize targets.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Gravitational Anchor	50	6	🔴 Rare. Chance for Hold proc. Popular in immobilize powers for bonus control.
Trap of the Hunter	10–50	6	Ranged defense bonus. Most common budget immobilize set.
Immobilise	10–50	6	Basic immobilize set.
Enfeebled Operation	10–50	6	AoE defense.
Dreadful Wound	10–20	6	Budget leveling set.
Debilitative Action	10–50	6	Cold resistance bonus.

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😴 Sleep Sets

Powers that put targets to sleep.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Fortunata Hypnosis	20–50	6	⭐ Chance for +Recharge proc. The best reason to take this set — fires on use to give a burst of recharge.
Call of the Sandman	10–50	6	+Regeneration bonus.
Lethargic Repose	10–50	6	Ranged defense bonus.

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😵 Stun Sets

Powers that disorient/stun targets.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Absolute Amazement	50	6	🔴 Rare. Fire/cold resistance at 3-piece. Chance for ToHit Debuff proc. Used in Howling Twilight on MM/Dark builds.
Rope a Dope	10–50	6	AoE defense bonus. Budget stun option.
Stupefy	10–50	6	Ranged defense bonus.

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😱 Fear Sets

Powers that fear targets.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Glimpse of the Abyss	10–50	6	⭐ Recharge bonus at 4-piece. Most popular fear set. Used in Fearsome Stare.
Unspeakable Terror	10–50	6	AoE defense bonus.

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❄️ Slow Movement Sets

Powers that slow targets' movement/recharge.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Tempered Readiness	10–50	6	⭐ Recharge bonus at 4-piece. Popular in Tar Patch and other slow powers.
Impeded Swiftness	10–50	6	⭐ Includes the Chance for Smashing Damage proc. Excellent in slow-component attacks (e.g., Demon Prince).
Pacing of the Turtle	10–50	6	Endurance discount bonus.

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🌊 Knockback / Knockdown Sets

Powers with knockback or knockdown effects.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Force Feedback	10–50	6	⭐ Includes the Chance for +Recharge proc — fires on knockback, giving burst recharge. Great in frequently-firing KB powers.
Knockback Distance	—	—	Common IO — converts knockback to knockdown (important for not scattering enemies).
Overwhelming Force	10–50	6	Includes the KB→KD proc (converts knockback to knockdown in the slotted power). Essential for knockback-heavy sets.

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🎯 Taunt Sets

Taunt and provoke powers (primarily Tanker/Brute).

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Mocking Beratement	10–50	6	Recharge bonus. Standard taunt set.
mocking beratement	—	—	See above

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👁️ ToHit Debuff Sets

Powers that reduce enemy accuracy/tohit.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Dark Watcher's Despair	10–50	6	⭐ Standard set for ToHit debuff powers. Used in Darkest Night.
Achilles' Heel	10–50	6	Includes the Chance for Resistance Debuff proc — fires to apply -resist on a hit. Excellent anywhere you want extra -resist stacking.
Undermined Defenses	21–50	6	Damage bonus at 5-piece.

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📈 ToHit Buff Sets

Powers that increase accuracy/tohit.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Gaussian's Synchronized Fire-Control	21–50	6	⭐ Includes the Chance for Build Up proc — fires on use to give a temporary damage boost. Invaluable in Tactics or any persistent ToHit buff.
Adjusted Targeting	10–50	6	Recharge bonus. Budget ToHit buff set.

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🐾 Pet Damage Sets

Powers that summon or control pets (Mastermind summon powers, Controller/Dominator pets).

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Blood Mandate	10–50	6	⭐ Best all-around pet set. Good acc/dam/end pieces and set bonuses including defense bonuses.
Soulbound Allegiance	10–50	6	⭐ Includes the Chance for Build Up proc — gives pets a temporary damage/tohit burst.
Command of the Mastermind	10–50	6	⭐ AoE defense bonus at 4-piece. Recharge bonus at 5-piece. Popular MM set.
Edict of the Master	10–50	6	Defense bonus. Cheaper alternative to Blood Mandate.
Sovereign Right	10–50	6	Resistance bonuses. Budget pet set.

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🐾 Recharge Intensive Pet Sets

For pets that have longer recharge times (Hell on Earth, Phantom Army, etc.). These are the home of the critical MM global uniques.

Set Name	Level Range	Pieces	Notable Bonuses / Notes
Expedient Reinforcement	20–50	6	⭐⭐ Includes the Resist Bonus unique — global pet resistance aura. Mandatory for MMs.
Call to Arms	10–50	6	⭐⭐ Includes the Defense Bonus unique — global pet defense aura. Mandatory for MMs.
Mark of Supremacy	20–50	6	⭐⭐ MM-exclusive. Includes End/Pets +Resistance and Acc/Pets +Defense global uniques. Both are mandatory for MMs.

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✈️ Travel Sets

Flight

Set Name	Level Range	Notes
Soaring	10–50	Run speed bonus. Standard flight set.
Freebird	10–50	Includes a +End unique.
Blessing of the Zephyr	10–50	⭐ Includes a Knockback Resist unique — reduces KB magnitude against you. And AoE defense bonus.

Running

Set Name	Level Range	Notes
Winter's Gift	10–50	⭐ Includes the Slow Resistance unique — global slow resistance. Excellent QoL. Also has AoE defense bonus.
Celerity	10–50	Includes a +Stealth unique for Sprint-slot stealth.
Quickfoot	10–50	Budget running set.

Jumping

Set Name	Level Range	Notes
Bounding Leap	10–50	Jump-based travel set.
Jumping IO	—	Common IO filler.

Teleport

Set Name	Level Range	Notes
Jaunt	10–50	Teleport-specific set.
Unbounded Leap	10–50	Also works for jump/teleport powers.

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💡 Defense Debuff Sets

Powers that reduce enemy defense.

Set Name	Level Range	Pieces	Notes
Analyze Weakness	10–50	6	Accuracy bonus. Standard defense debuff set.
Touch of Lady Grey	10–50	6	Includes a Chance for Negative Damage proc.
Siphon Insight	10–50	6	Recharge bonus.

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🌑 Archetype-Specific Sets (ATOs) Summary

ATOs drop from incarnate content or can be purchased with Reward Merits. Each archetype has a unique set with a powerful proc. Superior versions are level 50 only.

Archetype	ATO Set	Superior Set	Notable Proc
Blaster	Blaster's Wrath	Superior Blaster's Wrath	Damage boost proc
Corruptor	Malice of the Corruptor	Superior Malice of the Corruptor	+Regen on ally proc
Controller	Overpowering Presence	Superior Overpowering Presence	Extra control proc
Defender	Defender's Bastion	Superior Defender's Bastion	Team defense buff
Dominator	Dominating Grasp	Superior Dominating Grasp	Domination charge proc
Mastermind	Sovereign Right / Mark of Supremacy	Superior Mark of Supremacy	Pet buff uniques
Scrapper	Scrapper's Strike	Superior Scrapper's Strike	Build Up on crit
Stalker	Stalker's Guile	Superior Stalker's Guile	Assassin's Strike proc
Tanker	Tanker's Guarantee	Superior Tanker's Guarantee	Absorb shield proc
Brute	Brute's Fury	Superior Brute's Fury	Fury-based damage proc

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🌟 Universal / Highly Recommended Globals Summary

These single IOs are worth acquiring on virtually every build regardless of archetype:

IO	Set	Power Type	Effect
LotG +7.5% Recharge	Luck of the Gambler	Defense	⭐ Global recharge. Stack 4–6 across defense toggles.
Panacea +HP/+End	Panacea	Healing	⭐ Passive HP and endurance recovery.
Performance Shifter +End	Performance Shifter	End Mod	⭐ Passive endurance recovery.
Numina's +Regen/+Recovery	Numina's Convalescence	Healing	⭐ Passive regen and recovery.
Miracle +Recovery	Miracle	Healing	Passive endurance recovery.
Steadfast +3% Def	Steadfast Protection	Resistance	⭐ Global defense. One per build, slot in Tough.
Gladiator's Armor +3% Def	Gladiator's Armor	Defense	🔴 Global defense. Stacks with Steadfast for +6% total.
Reactive Defenses Scaling Res	Reactive Defenses	Defense	⭐ Scaling resistance as HP drops.
Kismet +6% ToHit	Kismet	Defense	Global ToHit. One per build, slot in Combat Jumping.
Shield Wall +5% Res	Shield Wall	Defense	🔴 Global resistance. Expensive.
Gaussian's Chance for Build Up	Gaussian's Sync. Fire-Control	ToHit Buff	⭐ Proc fires in Tactics or any persistent ToHit buff.
Achilles' Heel Chance for -Res	Achilles' Heel	ToHit Debuff	Proc applies -resistance on hit. Fires in debuff powers.
Impeded Swiftness Chance Smash	Impeded Swiftness	Slow	Proc fires in slow-component attacks.
Force Feedback +Recharge	Force Feedback	Knockback	Proc gives burst recharge on knockback procs.
Winter's Gift Slow Resist	Winter's Gift	Running	Global slow resistance. QoL for any build.
Blessing of the Zephyr KB Resist	Blessing of the Zephyr	Flight	Global knockback resistance.

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📋 Quick Set Bonus Reference

Key set bonuses to chase when building:

Bonus Type	Best Sources
+Recharge	LotG 7.5% (defense powers), Decimation (ranged), Tempered Readiness (slow), Doctored Wounds (heal), Positron's Blast (TAoE)
+Defense (Ranged)	Thunderstrike (ranged), Sting of the Manticore (sniper), Mako's Bite (melee), Trap of the Hunter (immob)
+Defense (Melee)	Kinetic Combat (melee), Obliteration (PBAoE)
+Defense (AoE)	Obliteration (PBAoE), Scirocco's Dervish (PBAoE), Bombardment (TAoE)
+Max HP	Unbreakable Guard (resistance), Devastation (ranged)
+Resistance	Shield Wall unique, Unbreakable Guard, various 3-piece rare set bonuses (Hecatomb, Ragnarok, Armageddon, etc.)
+Recovery	Miracle unique, Numina's unique, Performance Shifter proc
+Regen	Numina's unique, Panacea proc
Pet Defense/Resist	Mark of Supremacy, Expedient Reinforcement, Call to Arms (all in Hell on Earth for MMs)

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City of Heroes: Homecoming — IO Enhancement Sets Reference — Updated Issue 27+ Source: Homecoming Wiki, community builds, in-game data