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The Aeshi Nero (alternatively spelt Assy Nero in Metal Slug Attack) is the second boss from Metal Slug 2 and Metal Slug X.


The Aeshi Nero is a gigantic excavating machine resembling a cobra created by the Rebel Army. Although it is primarily designed for burrowing purpose, it can be re-purposed for combat in a pinch.

While Metal Slug 2/X implies that it is a Martian machine (as Martian-affiliate music plays during the fight instead of the standard boss music, and only supernatural enemies appear throughout the level; it is likely a reference to "alien hunters" who believe the Pyramids were built by aliens). Its description in Metal Slug Attack confirms that it was constructed by the Rebels to clear out room for a base.


The Aeshi Nero is fought in a tower inside a tomb, with it digging through and suddenly appearing from the bottom. Whenever the player climbs, it will also follow them, while launching missiles and electric balls. It will also intermittently charge and fire its laser cannon that will go up the entire tower. The laser is extremely fast, forcing the player to go to the edge of a wooden platform to avoid it. The missiles and electric balls are easy to dodge, but the fact that the player is in a limited space and can fall to their doom if one is not careful tends to make this boss a bit hard. Also, it may suddenly crawl up and electrocute the player with energy sparks, so keep on jumping up.

Having Slugnoid will make the battle much easier. However, losing the slug can make this fight quite annoying, as the player will need to constantly jump and shoot down. Sometimes a Rocket Launcher or a Heavy Machine Gun box will drop down. However, they may fall in the inside the boss's mouth, making the retrieval process difficult.


AeshiNeroIdle.gif Aeshi Nero: The original gigantic serpentine excavator.
Aeshi Nero MK II: A customized, almost jet-black version of the original version which is also capable of burrowing underground to acquire new targets, smashing them to bits when it emerges with a massive boulder.
Aeshi Nero MK III: Another customized variant, colored purple. Its power output and armor are a significant step up from the previous version, but the more extreme allocation of its power output means that it shoots rocks out without any precise accuracy.


  • If the player moves to the lower right platform below the last item on the tower with the right timing, Aeshi Nero will stop at the base of the tower and not damage the player, making it possible to defeat the boss without climbing the tower (by using the Slug to continuously fire downwards without jumping) or taking on its attacks. This glitch only works in Metal Slug 2, as in the revamped Metal Slug X, jumping on that platform will result in the eventual destruction of the Slugnoid (it is still possible to jump out of the slug or out of the Aeshi Nero's mouth).
Metal Slug TetsuyukiHairbuster RibertsTani OhShoe & KarnIron NokanaHi-Do
Mini-Bosses: Mini-BataAllen O'Neil
Metal Slug 2/X The Keesi II / Iron Nokana MK II (X) • Aeshi NeroDragon NosukeBig ShieeHozmiRugname
Mini-Bosses: Mosque ArtilleryThe Keesi II (X) • Karn (X) • Allen O'NeilDai-Manji
Metal Slug 3 Huge HermitMonoeye UFOJupiter KingSol Dae RokkerRootmars
Mini-Bosses: Twin Ohumein-CongaMonoeyesHairbuster RibertsHi-DoRugnameFake RootmarsClone Incubator
Metal Slug 4 Brave GuerrierToschka DalanueThe IronBig JohnSea SatanAmadeus Mother Computer
Mini-Bosses: Mecha Allen O'Neil
Metal Slug 5 Metal RearShooting RayScreamerSand MarineAvatar of Evil
Mini-Bosses: Black HoundStone Turtle (unused) • Gaia ElephantPtolemaios (unused)
Metal Slug 6 Bull DrillIron SentinelBrain RobotElder CentipedeInvader King
Mini-Bosses: Invader ControllerKing's Cocoon
Metal Slug 7/XX Iron Death WormCrablopsDestroyed CrablopsFall ClimberThe UnionRebel GigantKraken
Mini-Bosses: Scrap TowerBig Gate
Metal Slug: 1st Mission Rebel VTOLRebel TrainMacbaRebel ZeppelinElectromagnetic CraneWeapons Port BossMetal Strider
Mini-Bosses: Facility ElevatorMacbaRebel Truck
Metal Slug: 2nd Mission Big BerthaTerrain CarrierRebel ReactorMacbaRebel SubmarineTani OhWiredRebel AirplaneMetal StriderRocket UFO
Mini-Bosses: Power GeneratorsRebel RocketHyakutaro
Metal Slug Advance FormorEmain MachaKaladgolgThe Keesi IIICabracan
Mini-Bosses: Allen Jr.
Metal Slug 3D ParachuetruckMosque ArtillerySpider-BotUnderground Cruise MissileMorden's BattleshipMorden's CastleAllen O'NeilLugusLieu
Metal Slug Attack Pharaoh's ArcPtolemaiosBall SlugGreat MotherMars GigantalosK-O3 Coupled Armored VehicleLand BlowfishCyclobsterSlug SquareZoni DolomaQuadro JumperDenturionD-GuFortmeranianRock MoleGiant CopterEt A OmnisVortexDigger BaseCrusty LegsArmored CrawlerQueen Big Snail7000 Class LocomotiveRiviere HyllMetal Fusioner No.223Drum SlugMars WolfSea DragonTetsujin SquadLa TorneGigantnoidDark GateKnight Tank
Mobile games Rocket Control RoomUnknown AlienHellfireSpiderbotCyclopsMega Laser TurretMars Battle UFOM-32 Water Carrier PlaneKouraiAlien Floating Structure