Cost: 1200 (2450) 
+20 Physical Power
+15% Attack Speed
+7% Movement Speed
PASSIVE - Hitting an enemy god with a Basic Attack grants Haste for 1s, causing you to be immune from Basic Attack Movement Penalty.
Hastened Katana can only be used by Physical Melee gods.
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Advantages: Good added mobility both when basic attacking as well as when out of combat.
Disadvantages: No penetration.
Restrictions: Physical melee gods only.
Discussion: This is a utility item meant to be used by basic attackers to provide a consistently relentless attack on their targets. It's typically purchased early to mid build.
Masa is just part of that katana tree, so also falls under the same restriction that hunters can't use. Technically, it's not an aura item. It's triggered by proximity of enemies, but doesn't cast an aura that affects others. Think of any other "aura" item. Sov, Heart, Thebes, Jade, Void Stone, Void Shield, Pest, Pythag, Mystical Mail. Each of those affects others BESIDES yourself. They either give teammates benefits (protections, power, lifesteal) or they negatively affect enemies (reduced protections, damage, lowered healing).
Masa's passive only affects YOU. It's thus not an aura item, and you shouldn't be triggered. Instead, create a smurf account and stomp some noobs to get your spirits back up.