Outworld Devourer (previously known as Outworld Destroyer) is that rare beast – a ranged intelligence carry.
Typically played in the mid lane role, he is almost always able to convincingly win his lane and snowball from there, dishing out huge amounts of DPS based on his intelligence gain and mana pool.
Skills
Arcane Orb is skilled and maxed last.
Astral Imprisonment is skilled and maxed first. Use to mess up enemy laner's last hitting.
Essence Aura is skilled and maxed second.
Sanity's Eclipse is always skilled (levels 6, 11 and 16).
Items
Starting Items: Tangos, Healing Salve, 3x Iron Branches, Mantle of Intelligence.
Early Game: Bottle, Null Talisman, Boots of Speed, Magic Wand.
Core Items: Power Treads, Force Staff.
Luxury Items: Scythe of Vyse, Black King Bar, Rod of Atos, Orchid Malevolence, Shiva's Guard, Refresher Orb.
Situational Items: Boots of Travel, Hand of Midas, Necronomicon, Linken's Sphere.