Io, better known to many as Wisp, is a strength support hero with a global ganking presence who is typically partnered with a single hard carry to deliver one of the scariest ganking combos in the game.
Skills
Tether is always skilled first but is maxed last.
Spirits is skilled second but maxed first.
Overcharge is skilled last but maxed second.
Relocate is always skilled.
Items
Starting Items: Courier and/or Observer Wards, Tangos, Healing Salve, Gauntlets of Strength, Iron Branch.
Early Game: Flying Courier, Boots of Speed, Bottle, Magic Wand, Urn of Shadows or Bracer.
Core Items: Power Treads or Tranquil Boots or Arcane Boots & Mekanism.
Luxury Items: Drums of Endurance, Vladmir's Offering, Ghost Scepter, Black King Bar, Heaven's Halberd, Force Staff, Heart of Tarrasque, Shiva's Guard, Scythe of Vyse.
Situational Items: Gem of True Sight, Sentry Wards, Dust of Appearance, Medallion of Courage, Pipe of Insight, Necronomicon.