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Many hands make light work.
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Bad against...
- Arc Warden's reliance on his spells makes it important that he has enough mana to cast spells which Anti-Mage can easily burn with Mana Break.
- Blink mitigates the threat of Flux's slow, and allows Anti-Mage to close the distance between himself and Arc Warden.
- Anti-Mage's heightened farming capabilities lets him keep up with Arc Warden's farm while also de-pushing the lanes as Arc Warden constantly pushes through the use of his Tempest Double.
- Counterspell significantly reduces the effectiveness of Arc Warden's magic damage.
- Bristleback activates frequently while he escapes from Arc Warden's Necronomicon army.
- Arc Warden has little armor and mobility, which makes him an easy target to apply Quill Spray and Viscous Nasal Goo stacks.
- Chaos Knight can dispel Flux with Phantasm.
- Chaos Knight can use Reality Rift to pull Arc Warden out of Magnetic Field.
- Flux is severely impaired against Meepo because of Divided We Stand.
- Meepo's farming speed allows him to pressure Arc Warden before he is capable of fighting effectively.
- Without Black King Bar, Earthbind and Poof finish Arc Warden quickly before he has time to do much.
- Song of the Siren stops him from using any of his abilities.
- Her illusions can push better than Arc Warden's Tempest Double because Mirror Image has a longer duration.
- Mirror Image dispels Flux, and the illusions stop Flux from working.
- Smoke Screen prevents Arc Warden from initiating or helping his team.
- With Arc Warden's low mobility, Tricks of the Trade is wide enough to deal decent damage to him.
- Doppelganger dispels Flux.
- Phantom Rush closes the distance between Phantom Lancer and Arc Warden.
- Juxtapose overwhelms Arc Warden and nullifies his kit which is only effective against isolated opponents.
Others
- Heroes with summons or illusions to counter Flux: Broodmother, Chen, Shadow Demon.
- Slark, Lifestealer, Morphling and such with a good escape mechanism are a nuisance to deal with in the early-game.
Items
- Force Staff shoves Arc Warden or his allies out of Magnetic Field.
- Black King Bar makes magical Arc Warden useless (Note that he could still have a build with heavy physical damage, making Black King Bar useless later on).
- Diffusal Blade can burn Arc Warden's and his Tempest Double's mana, preventing him from using spells and items.
- Lotus Orb reflects all of Arc Warden's item usages back onto himself.
- Monkey King Bar allows enemies to attack Arc Warden through Magnetic Field.
- Manta Style can dispel Flux.
Good against...
- If Arc Warden builds Necronomicon 3 he can reveal Mirana's team while Moonlight Shadow is active.
- A Starstorm upgraded by Aghanim's Scepter can accidentally kill a Necronomicon Warrior, which can lead to her death if she hasn't built a Black King Bar.
- Arc Warden can use his summons to prevent Sacred Arrow from hitting himself or his allies.
- Mirana doesn't build items that give armor often, so she usually can't fight against a late game Arc Warden.
- Arc Warden’s Magnetic Field allows him to defend against Terrorblade if he used Metamorphosis.
- Arc also buys a Bloodthorn or a Scythe of Vyse, which can prevent Terrorblade from using his abilities.
- Tempest Double, Magnetic Field's attack speed bonus, and Arc Warden's high attack range will easily destroy a Phoenix using Supernova much faster than usual.
- Phoenix is very weak against pushers, especially those like Arc Warden who can kill him easily, as his skillset works best in teamfights.
- Magnetic Field's evasion completely negates Sniper's attacks unless he has True Strike.
- Sniper always positions himself far away from battles, which makes him especially vulnerable for Flux and Spark Wraith.
- Flux wastes Templar Assassin's Refraction unless she has a Black King Bar or a Manta Style.
- Spark Wraith can be used to bully a Templar Assassin that used Meld.
- Magnetic Field protects Arc Warden and allies from Drow Ranger's ranged attacks. She most likely will not enter the field since she will lose Marksmanship's bonus agility.
- Magnetic Field makes Impetus miss; if Enchantress decides to enter the field, she is giving up bonus damage since Impetus deals greater damage at higher distance away from targets.
Others
Works well with...
- Flux and Cold Feet also have some synergy. Spark Wraith also applies a 100% slow, in case Flux is muted by allies or neutrals.
- Ice Vortex does somewhat buff the heavy magic damage coming from Spark Wraiths and Flux. Two fluxes cast by both clones do stack, increasing the damage.
- A global Ice Blast can certainly help any hero with pick-off potential, like Arc Warden.
- Arc Warden has double benefit from Precision Aura. It also has high pushing potential together with Magnetic Field.
Others
- Ranged heroes who will benefit greatly from the attack speed given by Magnetic Field, such as Sniper or Shadow Fiend
