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DOTA 2 / HERO HISTORY

Io changes

Balance notes across the versions listed by Valve. An unchanged patch is a small victory for your muscle memory.

Change record

41 patches with recorded changes · 118 of 118 listed patches readable.

Coverage: Feb 1, 2018 to Sep 15, 2026. This feed does not include every patch in Dota’s lifetime.

Inspect coverage by patch

Sep 15, 2026

Io in 7.41f

  • TalentsLevel 15 Talent Spirits Damage decreased from +50% to +40%

May 6, 2026

Io in 7.41c

  • TetherHP/Mana Transfer decreased from 60/80/100/120% to 55/75/95/115%
  • SpiritsNow remembers the radius of the spirits between casts

Mar 27, 2026

Io in 7.41a

  • TalentsLevel 25 Talent Attack Tethered Ally's Target Damage decreased from 75% to 50%
  • EquilibriumMax Damage Amp and Max Heal Amplification decreased from 5 + 0.5% per level to 4 + 0.4% per level

Mar 24, 2026

Io in 7.41

  • Removed Wellspring innate ability
  • TalentsLevel 10 Talent Strength increased from +7 to +8
  • TalentsLevel 25 Talent Relocate Cast Delay Reduction increased from 1.5s to 2s
  • EquilibriumNew innate ability
  • EquilibriumIo always has bonus Outgoing Damage Amp which linearly scales with its health, reaching a maximum of 5% + 0.5% per level at 100% Health. At the same time, Io has Health Restoration and Healing Amplifications which also linearly scale with its health, but reach a maximum of 5% + 0.5% per level at zero Health
  • OverchargeNow also provides 35/60/85/110 Attack Speed and 8/10/12/14% Spell Amplification to Io and any tethered Allies

Dec 15, 2025

Io in 7.40

  • Base Strength increased from 17 to 19
  • Base Intelligence decreased from 23 to 21
  • Damage at level 1 unchanged (45–51)
  • TalentsLevel 10 Talent +12 Attack Damage to Tethered Units replaced with +7 Strength
  • TalentsLevel 15 Talent +60 Spirits Hero Damage replaced with +50% Spirits Damage
  • TalentsLevel 25 Talent Unslowable during Overcharge replaced with -1.5s Relocate Cast Delay
  • SpiritsMana Cost decreased from 100/110/120/130 to 90/100/110/120
  • SpiritsCooldown decreased from 22/21/20/19s to 15s
  • SpiritsDuration decreased from 19s to 15s

Aug 5, 2025

Io in 7.39d

  • SpiritsCooldown decreased from 26/24/22/20s to 22/21/20/19s

May 22, 2025

Io in 7.39

  • Removed Sight Seer innate ability
  • Wellspring: New Innate Ability. Passive, can't be leveled up
  • Consumable items and item abilities that restore Health and Mana over time affect Io twice as fast. Total amount of restored health or mana remains the same
  • This applies to Healing Salve, Tango, Clarity, Bottle, Urn of Shadows, Spirit Vessel, Pollywog Charm, and Mana Draught
  • Example: Usually Clarity restores 150 mana over 25s. For Io it will restore 150 mana over 12.5s
  • SpiritsAghanim's Scepter Movement Slow increased from 15% to 25%
  • RelocateCooldown decreased from 100/90/80s to 90/80/70s

Feb 18, 2025

Io in 7.38

  • Base Damage increased by 7
  • Damage at level 1 increased by 4 (from 41-47 to 45-51)
  • Strength gain increased from 2.7 to 3.0
  • Damage gain per level decreased from +4.2 to +2.8
  • Damage at level 30 decreased by 46 (from 192-198 to 146-152)
  • TalentsLevel 10 Talent +15% Tether Enemy Slow replaced with +1.5s Overcharge Duration
  • TalentsLevel 25 Talent +400 Health to Tethered Units replaced with Unslowable during Overcharge
  • TetherUpon casting Tether, Io now has a buff that shows Tether's remaining cooldown. This buff is only visible to Io and Io's allies
  • TetherEnemy Move/Attack Slow increased from 10/20/30/40% to 15/30/45/60%
  • TetherNo longer deals 15/25/35/45 Damage per second to enemies by default
  • TetherNow upgraded with Aghanim's Shard
  • TetherDeals 120 damage per second to enemies touching it. 50% of the damage dealt heals Io. This is considered a pseudo-lifesteal
  • Tether · ContextIt's amplified by spell lifesteal and healing amplification but does not have a creep penalty
  • OverchargeNo longer upgraded with Aghanim's Shard

Jun 6, 2024

Io in 7.36b

  • Medigun · OverchargeArmor increased from 3/6/9/12 to 4/7/10/13
  • Medigun · OverchargeMagic Resistance increased from 10/15/20/25% to 12/18/24/30%

May 22, 2024

Io in 7.36

  • Innate AbilityNew Innate ability. Passive, can't be leveled up
  • Innate AbilityIo's team takes 1s less to channel Watchers. When Watcher is under their control, its vision radius is increased by 300
  • Kritzkrieg · OverchargeGrants 35/60/85/110 Attack Speed and 8/10/12/14% Spell Amplification
  • Kritzkrieg · Overcharge · ContextUnchanged
  • Medigun · OverchargeGrants 3/6/9/12 Armor and 10/15/20/25% Magic Resistance
  • TalentsLevel 10 Talent Attack Damage to Tethered Units decreased from +15 to +12
  • TalentsLevel 15 Talent Tether Movement Speed decreased from +6% to +5%
  • TalentsLevel 15 Talent Spirits Hero Damage increased from +55 to +60
  • TalentsLevel 20 Talent Relocate Cooldown Reduction increased from 25s to 30s
  • TalentsLevel 25 Talent Attack Tethered Ally's Target now applies a 25% damage penalty on Io's attacks
  • TetherDamage per second increased from 10/20/30/40 to 15/25/35/45
  • TetherEnemy Move/Attack Slow decreased from 15/25/35/45% to 10/20/30/40%
  • SpiritsCreep Collision Damage increased from 10/15/20/25 to 12/18/24/30

Dec 14, 2023

Io in 7.35

  • TetherNow deals 10/20/30/40 damage per second to enemies caught in the tether. Tick rate: 0.5s

Aug 8, 2023

Io in 7.34

  • OverchargeAghanim's Shard no longer grants bonus spell amplification
  • OverchargeAghanim's Shard now grants 30% slow resistance

May 13, 2023

Io in 7.33c

  • Base Damage decreased by 3 (Level 1 damage increased by 2)

Apr 20, 2023

Io in 7.33

  • Now is a Universal Hero
  • Base Damage decreased from 13-19 to 7-13
  • Strength gain decreased from 3.0 to 2.7
  • Damage on level 1 decreased by 6 (from 45-51 to 39-45)
  • Damage gain per level increased from +2.7 to +3.6
  • SpiritsWith Aghanim's Scepter the ability can now be activated to explode the spirits, after which they begin spawning again. Cooldown is decreased by 50%. Cannot be activated if the ability is on cooldown

Aug 23, 2022

Io in 7.32

  • TalentsLevel 10 Talent +4 Health Regen replaced with +15% Tether Enemy Move/Attack Slow
  • TalentsLevel 15 Talent Spirits Hero Damage increased from +45 to +55
  • TetherHeal/Mana Transfer decreased from 75/90/105/120% to 60/80/100/120%
  • SpiritsMana Cost decreased from 120/130/140/150 to 100/110/120/130
  • OverchargeAttack Speed rescaled from 25/55/85/115 to 35/60/85/110

Jun 8, 2022

Io in 7.31d

  • OverchargeAttack Speed Bonus rescaled from 50/70/90/110 to 25/55/85/115

Feb 23, 2022

Io in 7.31

  • Reworked Shard. Passively grants Io 10% spell lifesteal. Increases Overcharge spell amplification by 10% and causes it to also share Io's current spell lifesteal with any Tethered units
  • TalentsLevel 10 Talent +30 damage replaced with +15 damage to Tethered units
  • TalentsLevel 15 Talent +15% spell lifesteal replaced with +6% Tether movement speed
  • TalentsLevel 15 Talent +300 Spirits max range replaced with +45 spirit damage
  • TalentsLevel 20 Talent +60 Spirit damage replaced with +0.2 Overcharge max HP regen bonus
  • TalentsLevel 25 Talent +900 health replaced with +400 health to Tethered units
  • TetherHeal transfer rescaled from 70/90/110/130% to 75/90/105/120%
  • SpiritsScepter now also causes Spirits to apply a 15% slow for 0.3 seconds when impacting an enemy hero
  • OverchargeCooldown increased from 22/20/18/16s to 25/22/19/16s
  • OverchargeSpell Amplification reduced from 10/12/14/16% to 8/10/12/14%

Oct 28, 2021

Io in 7.30e

  • TalentsLevel 10 Talent reduced from 5 Health Regen to 4
  • TalentsLevel 20 Talent reduced from -30s Relocate CD to -25
  • TetherShard speed bonus reduced from 10% to 8%

Aug 17, 2021

Io in 7.30

  • Max Tether distance increased from 900 to 1000
  • TetherHeal Amplification increased from 0.6/0.8/1.0/1.2 to 0.7/0.9/1.1/1.3

Apr 9, 2021

Io in 7.29

  • Level 25 Attack Talent now only attacks if Io is capable of attacking (not when stunned/disarmed/etc)
  • TalentsLevel 10 Talent reduced from +35 Damage to +30
  • TalentsLevel 10 Talent increased from +4 Health Regen to +5
  • TalentsLevel 15 Talent reduced from +325 Spirits Max Range to +300
  • TalentsLevel 15 Talent increased from +10% Spell Lifesteal to +15%
  • TalentsLevel 20 Talent increased from -25s Relocate Cooldown -30s
  • TalentsLevel 25 Talent increased from +700 Health to +900
  • TetherCast range reduced from 1800 to 1600
  • TetherNo longer unlocks max movement speed
  • TetherShard now stuns upon connecting with the Tether, rather than on Tether Break. Does not affect the same unit more than once every 7 seconds.
  • SpiritsMax distance reduced from 700 to 650
  • SpiritsCollision damage reduced from 10/20/30/40 to 10/15/20/25

Jan 10, 2021

Io in 7.28b

  • TetherShard movement bonus increased from +5% to +10%

Jul 15, 2020

Io in 7.27b

  • Base movement speed increased from 280 to 320

May 2, 2020

Io in 7.26c

  • TalentsLevel 20 Talent changed from +12 Armor to -25s Relocate Cooldown
  • TalentsLevel 25 Talent changed from -24s Relocate Cooldown to +700 Health

Feb 26, 2020

Io in 7.24b

  • OverchargeRegen from 0.55/0.7/0.85/1% to 0.5/0.6/0.7/0.8%

Jan 26, 2020

Io in 7.24

  • TalentsLevel 15 Talent changed from +120 Gold/Min to +400 Spirits Max Distance
  • OverchargeHeal reduced from 0.6/0.8/1/1.2% to 0.55/0.7/0.85/1%
  • OverchargeCooldown increased from 16 to 22/20/18/16

Sep 6, 2019

Io in 7.22g

  • TalentsLevel 10 Talent changed from Spirits Apply Slow to +90 Gold/Min
  • TalentsLevel 15 Talent changed from +75 Spirits Hero Damage to Spirits Apply Slow
  • TalentsLevel 20 Talent changed from +150 Gold/Min to +75 Spirits Hero Damage

Jul 14, 2019

Io in 7.22e

  • TetherHeal/restore transfer reduced from 90/110/130/150% to 60/90/120/150%

Jun 30, 2019

Io in 7.22d

  • TalentsLevel 20 Talent changed from Tether Grants Scepter Bonus to +15 Armor

Jun 9, 2019

Io in 7.22c

  • Attack range reduced from 575 to 500
  • Base armor increased by 1
  • Strength gain increased from 2.5 to 3
  • TalentsLevel 10 Talent changed from +20% XP Gain to Spirits Apply Slow
  • TetherRegen reduced from 105/120/135/150% to 90/110/130/150%
  • TetherCancel now has a 0.25s cooldown to prevent accidental uses
  • SpiritsNo longer slow

May 24, 2019

Io in 7.22

  • Added to Captains Mode
  • Added Scepter upgrade. Spirits now passively spawn around you constantly every second (max of 5 spirits at a given time)
  • TetherPull can now be interrupted if stunned during it (like Timber Chain)

Feb 16, 2019

Io in 7.21b

  • TalentsLevel 15 Talent changed from Tether Grants Scepter Bonus to +8 Health Regen
  • TalentsLevel 20 Talent changed from +16 Health Regen to Tether Grants Scepter Bonus
  • TetherNo longer makes you unslowable
  • SpiritsNo longer has a toggle cooldown
  • SpiritsMin range increased from 100 to 200
  • SpiritsRotation interval from every 2.4 seconds to 2.7
  • SpiritsNo longer does a micro animation interruption when initially casting (already has zero cast point)
  • OverchargeDamage reduction reduced from 15/20/25/30% to 5/10/15/20%
  • RelocateManacost increased from 100 to 175

Jan 29, 2019

Io in 7.21

  • Temporarily removed from Captains Mode
  • TalentsLevel 25 Talent changed from -60s Relocate Cooldown to -30s
  • TetherNow transfers health and mana even when Io is at max hp/mp
  • OverchargeNow has an 18 second cooldown and an 8 second duration. No longer has a 2 second toggle.
  • OverchargeNow costs 40/60/80/100 mana to cast. No longer cost 6% of health and mana per second.
  • OverchargeAttack speed bonus increased from 40/50/60/70 to 50/80/110/140
  • OverchargeDamage reduction increased from 5/10/15/20% to 15/20/25/30%
  • RelocateDelay increased from 2.7/2.35/2 to 3.5/3.25/3
  • RelocateCooldown reduced from 130/110/90 to 90/75/60
  • RelocateIs now cast delay again instead of channeling (being interrupted, silenced, rooted, etc will cancel the ability)

Nov 30, 2018

Io in 7.20d

  • TetherHeal/mp transfer rate from 1.2/1.3/1.4/1.5 to 1.05/1.2/1.35/1.5

Nov 19, 2018

Io in 7.20

  • SpiritsCooldown increased from 26/22/18/14 to 26/24/22/20

Sep 1, 2018

Io in 7.19b

  • TalentsLevel 10 Talent reduced from +25% XP to +20%
  • SpiritsCooldown from 20/18/16/14 to 26/22/18/14

Jun 25, 2018

Io in 7.18

  • RelocateNow has channel time instead of a cast delay

Jun 10, 2018

Io in 7.17

  • TalentsLevel 10 Talent reduced from +60 Damage to +45
  • TalentsLevel 20 Talent reduced from +20 Health Regen to +15
  • SpiritsDamage reduced from 25/50/75/100 to 20/40/60/80
  • TetherMovement speed reduced from 7/10/13/16 to 5/8/11/14%

May 27, 2018

Io in 7.16

  • Base movement speed reduced from 290 to 280
  • TalentsLevel 15 Talent reduced from +90 Spirits Damage to +75
  • TalentsLevel 20 Talent changed from Attacks Tether Ally's Target to +20 Health Regen
  • TalentsLevel 25 Talent changed from +50 Health Regen to Attacks Tether Ally's Target

Apr 24, 2018

Io in 7.14

  • TalentsLevel 10 Talent changed from +400 Spirits Max Range to +25% XP
  • TalentsLevel 25 Talent changed from Tether Stuns to -60s Relocate Cooldown
  • TetherCan now target Spell Immune allies
  • TetherCast point changed from 0.001 to 0
  • TetherNo longer applies slow on impact
  • SpiritsNow apply a 20/40/60/80% movement speed slow on impact for 0.3 seconds
  • SpiritsNow have two fixed positions they go to, 700 and 100 (No longer granular with toggles, but just a single press action)
  • SpiritsCreep damage increased from 8/14/20/26 to 10/18/26/34
  • SpiritsManacost from 150 to 120/130/140/150
  • SpiritsCollision AoE increased from 70 to 110
  • SpiritsExplosion damage AoE increased from 300 to 360
  • Spirits InOut is just one ability now, alternates the direction (has a 1.5 second cooldown, same hotkey as spirits ability)
  • Spirits In · ContextBase cooldown/duration is still the same

Mar 29, 2018

Io in 7.12

  • Base damage reduced by 4
  • TetherNow sets your movement speed to match the tethered target's speed
  • TetherNo longer has a duration
  • TetherMovement speed rescaled from 10/12/14/16% to 7/10/13/16%
  • TetherRegen sharing rescaled from 1.5x to 1.2/1.3/1.4/1.5
  • RelocateCooldown increased from 120/100/80 to 130/110/90

Mar 1, 2018

Io in 7.10

  • TetherDuration increased from 12 to 14

Source: Valve’s public Dota 2 data feeds. Notes belong to Valve. Dates use Bellevue time (Pacific).