Io

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Io
19 + 3
14 + 1.6
21 + 1.7
Grants the following bonuses per level:
+66HP and +0.3HP regeneration
+0.27 armor and 1.6 attack speed
+20.4MP and +0.085MP regeneration
+0.1% base magic resistance
+2.84 Main Attack Damage
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3.33
Armor
(645.49 EHP)
27.1%
Magic Resist
(738 EHP)
1200
Projectile Speed
Melee Melee units have their projectile speed set to 900, if they should ever need it.
100 (114)
(1.7 BAT)
Base Attack Time Attacks per Second is defined as
ΣAS / BAT / 100
0.3 + 0.4
Turn Rate This unit takes 0.15s to turn 180°.
This ability component has a different effect during daytime. 1800 / This ability component has a different effect during nighttime. 800
Ethereal
Gib Type
2012-06-28
Released
2010-07-24
Competitive Span
2012-07-05 — 2019-01-29
2019-05-24 — Present
Version Control
This article is mostly accurate for 7.40, the last version this hero was changed in.

New interactions that emerged in following patches may have not yet been accounted for.
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Links to its allies to buff them.
The phenomenon that is Io manifests on the physical plane as a wisp of light, its purpose beyond mortal understanding. Accompanied by complementary Spirits that roam around the wisp at its will, it flits to and fro the battlefield, searching for an ally to Tether to. Those blessed with Io's bond feel their feet lighten as the Wisp channels its own regenerative powers into their body. Should its host falter, Io begins to Overcharge, augmenting that ally's speed while strengthening his resolve. As a force unbound by the laws of corporeal space, Io is able to temporarily Relocate itself and an ally to any point in the world, often saving a companion from certain death.
Tether
Tether
Spirits
Spirits
Overcharge
Overcharge
Spirits In
Spirits Out
Relocate
Roles:Support Support Escape Escape Nuker Nuker
AdjectivesBlue, Flying
Legs ( 0 )
Kritzkrieg
Overcharge
Overcharge grants bonus attack speed and bonus spell damage amplification.
Medigun
Overcharge
Overcharge grants bonus armor and bonus magic resistance.

Upgrades

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Aghanim's

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Upgradable by Aghanim's Scepter.
Aghanim's Scepter Upgrade:
Spirits
Spirits now passively spawn, orbits and replenishes itself around Io constantly.

Applies movement speed slow to enemy heroes coming in contact with.

Reduces cooldown, and now causes Spirits to immediately explode upon cast.
Upgradable by Aghanim's Shard.
Aghanim's Shard Upgrade:
Tether
The link between Io and the affected allied unit applies a brief slow to enemy units coming in contact.

Talents

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Instant Attack Tethered Ally's Target25-1.5s Relocate Effect Delay
-30s Relocate Cooldown20+0.2% Overcharge Max Health as Health Regen Bonus
x1.5 Spirits Damage15+5% Tether Move Speed
+7 Strength10+1.5s Overcharge Duration
▃ ▃ ▃ ▃ ▃ ▃ ▃
+2 All / / Attributes

Bio

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Beep Boop
▶️  Io, the Wisp
Io is everywhere, and in all things. Denounced by enemies as the great unmaker, worshiped by scholars as the twinkling of a divine eye, this strange Wisp of life-force occupies all planes at once, the merest fraction of its being crossing into physical existence at any one moment.

Like the great twin riders Dark and Light, and yet another ancient traveler whose true history is lost to the ages, Io the Wisp is a Fundamental of the universe, a force older than time, a wanderer from realms far beyond mortal understanding. Io is nothing less than the sum of all attractive and repulsive forces within the material field, a sentient manifestation of the charge that bind existence together. It is only in the controlled warping of these electrical waylines that Io's presence can be experienced on the physical plane. A benevolent, cooperative force, Io bonds its strange magnetism to others so that the power of allies might be enhanced. Its motives inscrutable, its strength unimaginable, Io moves through the physical plane, the perfect expression of the mysteries of the universe.
Voice:
Itself (Responses)

Wellspring

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Wellspring
This ability can be bestowed by Illusions. Fully disabled by Break.
Passive
Affects
Self
Consumable items and item abilities that either heals over time or mana regenerate over time affect Io twice as fast, with the total amount of restored value being the same.
Consumable Speed Factor: 2

Hero Model

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Hero Model
This ability can be bestowed by Illusions. Neither affected nor disabled by Break.
Passive / Channeling
Affects
Self
Io's hero model has the following hidden Innate. innate abilities.

It may only perform or utilize the ability's functions upon a successful channeling.
Io is considered a ground unit, despite its hero model showing otherwise.
Io's facing direction is a mystery. However, if you watch closely, the facing direction is marked by an arc-like effect.
Effect Distance: 256

Abilities

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Tether

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Unit / Passive
Affects
Self / Units
Instant Attack / Physical
Tethers itself to an allied unit.

The link breaks when either the tethered-ally moves too far away, or Io cancels it.
Cast RangeAffected by Cast Range increasing sources. 1600
Break Distance: Affected by AoE Radius increasing sources. 1000
Pull Distance: 700
Break Distance During Pull: 2150
Grants bonus movement speed to both Io and the tethered-ally while active.

Whenever Io restores health or mana, the tethered-ally gains a bonus portion of the restoration.
Ally Heal Factor: Affected by Heal Manipulation sources. 0.6/0.8/1/1.2
Ally Mana Restore Factor: Affected by Mana Restore Manipulation sources. 0.6/0.8/1/1.2
Ally Move Speed Bonus: 6%/8%/10%/12% (With level 15 Right Talent.With level 15 Right Talent. 11%/13%/15%/17%)
The link between Io and the affected allied unit applies a brief slow to enemy units coming in contact.
Move Speed Slow: 10%/20%/30%/40%
Attack Speed Slow: 10/20/30/40
Talent Upgrade
Io instant attacks the tether-affected ally's attacking target upon learning a certain talent.
Instant Attack Damage Factor: (With level 25 Left Talent.With level 25 Left Talent. 0.75)
Aghanim's Shard Upgrade
Aghanim's Shard Upgrade
Additionally deals damage per second to enemy units upon coming in contact with the Tether, and self-heals for a portion of the damage dealt.
Damage per Second: (Upgradable by Aghanim's Shard. 120)
Heal per Second: Utilizes Lifesteal. Affected by Health Restore sources. (Upgradable by Aghanim's Shard. 60)
12
Mana Cost
40
The benevolent touch of Io brings strength from between the planes.

Break Tether

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Q
T
Break Tether
Casting this ability does not proc any on-cast effects.
Affects
Self
Breaks the link to the tether-affected allied unit.
The sub-ability has a downtime upon Tether cast.
Downtime: 0.25
1
Details

Spirits

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No / Passive
Affects
Enemy Units
Spell / Magical
Summon a number of particles that orbit around Io. If a particle collides with an enemy hero, it explodes and damages all enemy units within the radius.

When its duration ends, all remaining particles explode.
Number of Spirits: 5
Hero Search Radius: Affected by AoE Radius increasing sources. 110
Explosion Radius: 360
Explosion Damage: 30/50/70/90 (With level 15 Left Talent.With level 15 Left Talent. 45/75/105/135)
Duration: 15 (Upgradable by Aghanim's Scepter. Indefinite (with Aghanim's Scepter))
Move Speed Slow: (Upgradable by Aghanim's Scepter. 25%)
Slow Duration: (Upgradable by Aghanim's Scepter. 0.3)
The particles' damage is less effective on creeps, but they do not explode upon collision.
Creep Collision Radius: Affected by AoE Radius increasing sources. 150
Collision Damage: 10/15/20/25 (With level 15 Left Talent.With level 15 Left Talent. 15/22.5/30/37.5)
Aghanim's Scepter Upgrade
Aghanim's Scepter Upgrade
Spirits now passively spawn, orbits and replenishes itself around Io constantly.

Applies movement speed slow to enemy heroes coming in contact with.

Reduces cooldown, and now causes Spirits to immediately explode upon cast.
Spirit Spawn Interval: (Upgradable by Aghanim's Scepter. 1)
15 (Upgradable by Aghanim's Scepter. 7.5)
Mana Cost
90/100/110/120
Io twists the particles of the universe with its unimaginable capabilities.

Spirits In

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D
D
Spirits In
Casting this ability does not proc any on-cast effects.
Toggle
Affects
Self
Calls and attracts in all the particle-like spirits to the Fundamental.
Min Distance: 200
Spirits Speed: 250
Aghanim's Scepter Upgrade
Aghanim's Scepter Upgrade
As the spirits now permanently orbits the Fundamental, it keeps the ability to call and attract in all the particle-like spirits.

Spirits Out

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F
E
Spirits Out
Casting this ability does not proc any on-cast effects.
Toggle
Affects
Self
Sends and repulses out all the particle-like spirits from the Fundamental.
Max Distance: Affected by AoE Radius increasing sources. 650
Spirits Speed: 250
Aghanim's Scepter Upgrade
Aghanim's Scepter Upgrade
As the spirits now permanently orbits the Fundamental, it sends and repulses these particles as the wisp wishes.

Overcharge

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E
V
Overcharge
Affects
Self / Allied Units
Grants max health as bonus health regeneration.
Max Health as Health Regen Bonus: 0.5%/0.6%/0.7%/0.8% (With level 20 Right Talent.With level 20 Right Talent. 0.7%/0.8%/0.9%/1%)
Duration: 8 (With level 10 Right Talent.With level 10 Right Talent. 9.5)
Grants the tethered allied unit all Overcharges' ability effects as well.
25/22/19/16
Mana Cost
40/60/80/100
Drawing on the energy of matter from all worlds, Io begins the unravelling of time.

Relocate

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Point
Affects
Self / Allied Heroes
Teleports Io to any location globally.

Upon the duration expires, Io will return to the original ability cast location.
Effect Delay: 3.5/3.25/3 (With level 25 Right Talent.With level 25 Right Talent. 2/1.75/1.5)
Duration: 12
Teleports the tethered allied unit alongside with Io.

Upon the duration expiring, Io and the tethered allied unit will return to the original ability cast location.
90/80/70 (With level 20 Left Talent.With level 20 Left Talent. 60/50/40)
Mana Cost
175
Io is the embodiment of the mystery of the universe.

Recent Matches

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Main Article: Io/Matches
DateTierTournamentPicksScorevs. Picks
January 12, 2026 - 18:20 EETQualifierEEU OQ1 ESL One BirminghamEEU OQ1 ESL One BirminghamEEU OQ1 ESL One BirminghamTiny Batrider Io Leshrac Enigma
1 : 0
Timbersaw Spirit Breaker Weaver Disruptor Tinker
January 9, 2026 - 16:00 CETQualifierWEU CQ DreamLeague S28WEU CQ DreamLeague S28WEU CQ DreamLeague S28Io Treant Protector Dragon Knight Sniper Pangolier
0 : 1
Shadow Shaman Kunkka Undying Viper Storm Spirit
January 7, 2026 - 17:40 EETQualifierEEU OQ2 DreamLeague S28EEU OQ2 DreamLeague S28EEU OQ2 DreamLeague S28Batrider Io Ember Spirit Pudge Leshrac
0 : 1
Shadow Fiend Ogre Magi Ringmaster Huskar Tidehunter
January 7, 2026 - 16:00 CETQualifierWEU OQ2 DreamLeague S28WEU OQ2 DreamLeague S28WEU OQ2 DreamLeague S28Io Beastmaster Skywrath Mage Pudge Ember Spirit
1 : 0
Jakiro Queen of Pain Snapfire Dawnbreaker Dragon Knight
January 5, 2026 - 18:25 CETQualifierWEU OQ1 DreamLeague S28WEU OQ1 DreamLeague S28WEU OQ1 DreamLeague S28Dark Willow Shadow Fiend Io Marci Invoker
0 : 1
Slardar Keeper of the Light Ogre Magi Troll Warlord Windranger
  • Io has won the following final matches in The International of the following years:

Recent Changes

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Main Articles: Changelogs, Old Abilities and Hero Lore
Description
7.40
(2025-12-15)
  • Increased base Strength strength from 17 to 19.
  • Reduced base Intelligence intelligence from 23 to 21.
  • Spirits
    • Reduced duration from 19 to 15.
    • Reduced cooldown from 22/21/20/19 to 15 on each level.
    • Reduced mana cost from 100/110/120/130 to 90/100/110/120.
7.39d
(2025-08-05)
  • Reduced Spirits cooldown from 26/24/22/20 to 22/21/20/19.
7.39
(2025-05-21)

Dota Plus Progress

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Main Article: Hero Challenges

Relics track a hero's actions and statistics, and display in-game notifications when a milestone is reached. They are only available to Dota Plus subscribers.

Io's Relics Voice Lines

Tether Slows

Spirits Damage

Overcharge Allies Duration

Damage During Relocate

Damage During Tether

Total Healing

Urn of Shadows Charges Used

Allies Glimmer Cape Duration

Dominating Kill Streaks

Dusts Leading To Kills

Enemy Ward Kills

Wards Placed

Kill Assists

Kills

Bronze

Silver

Gold

Platinum

Master

Grandmaster

Equipment

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Trivia

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  • Io is the name of a priestess of Hera in Greek Mythology. She was seduced by Zeus and subsequently incurred Hera's wrath.
    • Io is also the name of one of four Galilean moons of Jupiter, which was named after the same character in Greek Mythology.
  • Enigma, Chaos Knight, Keeper of the Light, and Io together represent the four fundamental forces of the universe with Io representing the electromagnetic force, as alluded to in its lore as the attractive and repulsive force, the charge that binds existence together, its powers over magnetism, as well as its abilities which requires Io to pull itself towards allies.
  • Warcraft 3 similarities:
    • Io uses the model of the Wisp, the Night Elf worker unit.
    • In DotA, Io's title is Guardian Wisp. It got shortened to just Wisp in Dota 2.
    • Io has a 1/14 chance to spawn in with the name "Santelmo", referencing St. Elmo's Fire, a rare weather phenomenon.
      • In Philippino folk lore, this is known as Apoy ni San Elmo, commonly shortened to Santelmo, refering to a flying spirit.
    • Io has a 1/14 chance to spawn in with the name "Weird Ball". This is not a reference to anything, it's just a fun name.
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