io Strategy

Io, The Guardian Wisp is a new strength ranged hero added in DotA Allstars 6.68 by IceFrog. Io, The Guardian Wisp is the one the most popular models found in Warcraft 3 and now added to it's famous custom map DotA Allstars v6.68, you can read Io, Guardian Wisp Starategy Guide here including all the DotA The Guardian Wisp Items/Skill Builds.
Io, The Guardian Wisp Stats:
Range: 525
Movement Speed: 295
Hero Type: Strength
Starting Armor: 0
Starting Damage: 33-42
Agility: 14 + 1.6
Strength: 17 + 1.9
Intelligence: 23 + 1.7
Io, The Guardian Wisp Spells:

1. Tether (hotkey: T)
Io tethers himself to an allied unit, granting both units bonus movement speed. Any enemy units that contact the tether will be stunned. The tether will break if it stretches beyond 900 units. Lasts 12 seconds.
Movement Bonus: 20/25/30/35%
Stun Duration: 1.25/1.5/1.75/2.0
Cooldown: 12
Manacost: 40

If you try to tether a unit that is a outside its range (by up to 900) Io will latch on and pull himself closer to the unit.
Tether transfers other states on the hero to the allied unit. This includes Overcharge, Relocate and any time you regenerate hp/mp.
Note: Has a sub ability that lets you break the tether.

2. Spirits (hotkey: W):
Io summons 5 ancient Spirits over the course of 6 seconds; the Spirits dance around Io in a circle to protect him. If an enemy hero moves close enough to touch a Spirit, the Spirit releases its life energy in a burst, damaging and slowing all enemies in a 300 area of effect. Non hero units only take minor damage upon touching a spirit and do not cause them to explode.
You have two sub abilities. One to move them outwards and one to call them back in. You can stop them at any distance by toggling the ability order.

Damage per Spirit: 25/50/75/100
Slow: 30%
Cooldown: 14
Manacost: 120/130/140/150

3. Overcharge (hotkey: V)
Io draws on more energy than he can safely handle, granting him bonus attack speed, but draining 2.5% of his current HP and MP per second. If Io is tethered to an ally the bonus attack speed is also granted to that ally.
This is a toggle ability.

Attack Speed: 60/80/100/120
Note: This bonus affects a tethered unit as well.

4. Ultimate: Relocate (hotkey: R)
Io temporary relocates himself, along with any tethered hero, to the target location for 12 seconds.
There is a casting delay and the enemy has visual indicators on the minimap and the world of the teleport before it happens.

Cast Delay: 2.5/2.25/2.0
Cooldown: 80/60/40
Manacost: 100
Note: If an allied hero is Tethered, that hero will teleported along with you. You can break the tether at any time to prevent that hero from returning back with you. -disablehelp is available for this ability.