Harbinger the Outworld Destroyer a quick guide
March 6, 2012
OD is a glass cannon DPS hero. When he gets good INT items, his orb adds a pure damage nuke to each attack and his ultimate deals tons of AoE damage.
Early game, spamming Astral gives him good damage for last hitting and harassing while crippling the enemy. This works best against other solos and INT heroes.
Level 4 Essence Aura means that, on average, you recover 10% of your mana pool per cast.
Don't be afraid to cast your ult on smart heroes - it heavily drains their mana if it doesn't deal too much damage to them.
Don't get Aghs or mana regen items - OD doesn't need these.