Outworld Devourer

Use Astral Imprisonment on the enemy hero to prevent them from last hitting or denying creeps, especially the ranged creep.

Use Arcane Orb on opponents off cooldown during laning stage as it does tons of damage. You can also secure last hits with it for more damage.

After using Astral Imprisonment, the opponents might go on you, so be careful.

Remember to activate Black King Bar in fights, especially before enemies are able to disable you at the start of fights.

Arcane Orb works on Ancients. So choose to farm Ancients instead of normal camps whenever possible for more farm.

Arcane Orb works on Roshan. So you can take it early with an ally tanking for you.

Look out for the amount of mana lost from multiple Astral Imprisonment usages. Outworld Destroyer can nuke you with his ultimate if there is a big mana pool difference.

Focus Outworld Destroyer in the fights as he provides saves for his team with Astral Imprisonment.

Mana pool increasing items are great against OD's Sanity's Eclipse.

Spell immunity items are great against Outworld Destroyer.

Heaven's Halberd is great at disabling Outworld Destroyer from using Arcane Orb.