Io

Stats

These are the base values written in the game files. Totals derived from attributes (HP, mana, armor) depend on engine-side formulas, so no estimated values are shown.

Recommended items

Items the in-game shop recommends for this hero (curated by Valve). These are not win-rate statistics.

Bottle 675 Urn of Shadows 825 Magic Wand 460 Boots of Speed 500 Glimmer Cape 2150 Arcane Boots 1500 Spirit Vessel 2725 Ghost Scepter 1500 Mekansm 1775 Guardian Greaves 4450 Tranquil Boots 900 Power Treads 1400

Abilities

Tether

Cooldown 12s Mana 40 / 40 / 40 / 40 Range 1600

ActiveCooldown12sMana40 / 40 / 40 / 40Range1600

Tethers Io to an allied unit, granting bonus movement speed to both. When Io restores health or mana, the tethered unit gains a portion of that amount. The tether breaks when the allied unit moves too far away, or Io cancels the tether. Tether slows enemies touching it.

Raw values (from the game files)（10）

MAX TETHER DISTANCE	1000
%MOVEMENT SPEED BONUS	6 / 8 / 10 / 12
latch_distance	700
latch_speed	1000
%HP/MANA TRANSFER	55 / 75 / 95 / 115
tether_mana_amp	55 / 75 / 95 / 115
%ENEMY MOVE/ATTACK SLOW	15 / 30 / 45 / 60
slow_duration	0.2
DAMAGE PER SECOND	0
tick_rate	0.5

• If you try to tether a unit that is 700 distance or further away from Io, Io will latch on and pull itself closer to the tethered unit (to a distance of 300).
• The tethered unit will heal faster and will heal even if Io is at full health.
• Io's movement speed matches the tethered unit's.

Patch history

7.41c 2026-05-06

• HP/Mana Transfer decreased from 60/80/100/120% to 55/75/95/115%

Spirits

Cooldown 15s Mana 90 / 100 / 110 / 120 MAGICAL

ActiveCooldown15sMana90 / 100 / 110 / 120

Summon five particle spirits that dance in a circle around Io. If a particle collides with an enemy hero, it explodes, damaging all enemy units in an area around it. Creeps take minor damage from touching a particle spirit, but do not cause them to explode. When its duration ends, any remaining Spirits explode.

Raw values (from the game files)（15）

CREEP DAMAGE	12 / 18 / 24 / 30
HERO DAMAGE	30 / 50 / 70 / 90
revolution_time	5.0 / 5.0 / 5.0 / 5.0
min_range	200
default_radius	425
OSCILLATION RADIUS	650
hero_hit_radius	110
EXPLOSION RADIUS	360
hit_radius	150
spirit_movement_rate	250
DURATION	15
spirit_amount	5
%MOVEMENT SLOW	0
SLOW DURATION	0
spirit_spawn_time	1.0

• After summoning, Io can call the spirits in and out.

Patch history

7.41c 2026-05-06

• Now remembers the radius of the spirits between casts

7.40 2025-12-15

• Mana Cost decreased from 100/110/120/130 to 90/100/110/120
• Cooldown decreased from 22/21/20/19s to 15s
• Duration decreased from 19s to 15s

Overcharge

Cooldown 25 / 22 / 19 / 16s Mana 40 / 60 / 80 / 100

ActiveCooldown25 / 22 / 19 / 16sMana40 / 60 / 80 / 100

Io gains attack speed, spell amplification, and health regeneration based on max health. If Io is Tethered to an ally, that unit also gains any bonuses granted by Overcharge.

Raw values (from the game files)（6）

BONUS ATTACK SPEED	35 / 60 / 85 / 110
%BONUS SPELL AMP	8 / 10 / 12 / 14
BONUS ARMOR	0
%BONUS MAGIC RESISTANCE	0
%MAX HEALTH REGEN	0.5 / 0.6 / 0.7 / 0.8
DURATION	8

Patch history

7.41 2026-03-24

• Now also provides 35/60/85/110 Attack Speed and 8/10/12/14% Spell Amplification to Io and any tethered Allies

Spirits In

Cooldown 0s

ActiveCooldown0s

Sends the spirits closer to you. Can be toggled on and off.

Spirits Out

Active

Sends the spirits farther away from you. Can be toggled on and off.

Relocate

Cooldown 90 / 80 / 70s Mana 175

ActiveCooldown90 / 80 / 70sMana175

Teleports Io and a tethered ally to any location. After the spell expires, Io and the tethered ally will return to their original location. Double-click to teleport to your team's base fountain.

Raw values (from the game files)（2）

CAST TIME	3.5 / 3.25 / 3.0
RETURN TIME	12.0 / 12.0 / 12.0

• Enemies receive a visual indicator in the world and on the minimap of the target location during the cast delay.
• If Io is disabled during the cast delay, Relocate is cancelled.
• If an allied hero is Tethered, that hero will teleport along with you. You can break the tether at any time to prevent that hero from teleporting with you.
• Only heroes, creep heroes, and illusions can be relocated.

Break Tether

Cooldown 1.0 / 1.0 / 1.0 / 1.0 / 1.0s

ActiveCooldown1.0 / 1.0 / 1.0 / 1.0 / 1.0s

Break the link to the tethered unit.

Equilibrium Innate Passive

Passive

Io gains outgoing damage amplification the closer it is to full health, and Health Restoration and Healing Amplification the closer it is to zero health.

Raw values (from the game files)（2）

%MAX DAMAGE AMP	4
%MAX HEAL AMP	4

Patch history

7.41a 2026-03-27

• Max Damage Amp and Max Heal Amplification decreased from 5 + 0.5% per level to 4 + 0.4% per level

7.41 2026-03-24

• New innate ability
• Io 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

Talents

One of the two per level is chosen. They appear in the order registered in the game files.

Patch history (hero and talents)

Background

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.

Details