Continuously using Arcane Orb on an enemy
if your mana permits.
The damage is based on your mana pool; thus more intelligence and mana should help your damage and ability.
Works on Roshan.
Use Astral Imprisonment to save an ally or prevent an enemy from following-through on a last-hit or a gank. Use Astral Imprisonment to initiate on an enemy or to utilize a front-line hero to damage his allies around him.
Astral Imprisonments damage affects the target as well (if an enemy). Allies can move while imprisoned.
Use this on Strength and Agility heroes with a small mana pool. Initiate with stealing intelligence (Astral Imprisonment) to then finish with your ultimate:
1. Collect as much intelligence as possible with Astral Imprisonment
2. Cast Astral Imprisonment on a carry or initiator
3. Finish with Sanitys Eclipse across the enemy team.
Combined with Arcane Orb means returned mana for more damage. Activate your passive after you cast Astral Imprisonment, thus when the enemy returns, they take damag and are significantly slowed.
Plant a tree with iron branch to consume with tangos to increase your regeneration - especially useful in the mid-lane where you want to save starting items to afford early game items like bottle or boots of speed.
Iron Branch can be placed on the ground to then be consumed by on your tangos for additional healing.
Early (Buy regen if low)
Meteor Hammer is a great follow-up damage and stun extender for OD and his ability: Astral Imprisonment.
Try to time the landing of Meteor Hammer so it chains after your Astral Imprisonment duration.
Core (Required, in order)
Opt for Magic Stick early if the enemy spam a lot of spells or you’ll be in the lane significantly. Magic Wand can be bought as early as before Boots of Speed or as late as after your core Boots upgrade depending on how the enemy and their spell usage. Magic Wand can also be bought to make room for other items due to limited space.
The value of Force Staff is multiple. You can use it as a pseudo-blink if youre a support hero. More importantly, it can be used to pull an ally away after being engaged or initiated on. This can force enemies to have to commit harder to a kill than they want to or bringing an ally closer to their teammates more quickly.
You will find yourself constantly targeted down due to your incredible damage from Arcane Orb. Black King Bar is to prevent this and ensure you can follow-up with your damage.
Situation (only if needed)
Aghs Shard provides additional for value and utility for OD by saving allies that may get caught out, himself to maneuver around or simply provide more mana so you can land your Arcane Orb and Sanitys Eclipse with more damage.
If your farm is interrupted and you are going to opt for larger items from the get-go. Go for Hand of Midas.
Hand of Midas is valuable only if you know the game will go late and you can take advantage of that with early-levels and faster farm.
Witch Blade pairs perfectly well with OD combined with Arcane Orb, a projectile that moves more quickly thanks to Witch Blade and the attack speed necessary to keep up with a such a low cooldown ability.
Aeon Disk helps you get out of a jam where you are constantly being chain-stunned or destroyed by abilities like Faceless Voids ultimate or PAs massive critical strikes.
Kaya and Sange alleviates the chain stuns and silences that OD will receive, increase your magic output and mana gain to alleviate you of any concern.
By rushing Hurricane Pike, youll be able to get a few hits in, pop Hurricane Pike and then follow-through on nuking your enemy from an incredible range.
Extension (choice, Any order)
Astral Imprisonment to let your Blink Dagger get off cooldown, then use it to escape! Very underrated item on Outworld Devourer.
Combine this with Force Staff will allow Outworld Devourer go in and out of battle while ensuring he can deal damage at a safe range.
You can gank foes, Astral Imprison them and then Arcane Orb them to death.
The thing OD needs most is attack speed. While all other items provide decent attack speed, only Moon Shard provides the most at its relative cost.
Aghanims Scepter allows you to disable nearly half the team as you focus on Arcane Orb the rest of the team.
Shivas Guard adds extra armor against physical carries while offering a slow to allow you to continue destroying nearby foes.
The intelligence improves your ultimate as well as Arcane Orb based on an improved mana pool.
For heroes with a large spell cooldown on their ultimate, Octarine Core is a great assistance, especially if you naturally build into it by having its components created earlier in the game.
Scythe of Vyse is a great item for your ultimate and Arcane Orb because of the intelligence it offers; the disable to allow Outworld Devourer to cast Arcane Orb without fear of retaliation or fighting back.
An alternative to Black King Bar where you are being targeted by few spells, but need the stats to improve your overall ability from stats to survivability and attack speed with Arcane Orb.
More intelligence, more health and a root to boot. Great item for Outworld Devourer. Rod of Atos allows you to keep an enemy within your range for Arcane Orb while also improving your intelligence, making your damage even greater.
Monkey King Bar is ideal for users who need additional attack speed and versus evasive heroes either via Butterfly, inherent passive abilities or cause you to miss attacks. Monkey King Bar not only provides strong attack speed but also heightens your ability to your enemies with your attacks.