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Iron
Sentinel

This page relates to a Metal Slug Attack unit; for information about this boss in the main series, see Iron Sentinel.

MSAUnitSilver
MSAUnit Iron Sentinel
Iron Sentinel
Rarity
MSA rarity Super Rare
Faction
MSD faction Rebel Army 24px Rebel Army
AP cost
MSA dot III 900
MSA dot IV 810
MSA dot V 720
Optimal range
Long
Traits
Critical
Second Form
Playable since
1.8.0
In-Game Description
"This ultra-giant size missile tank was created in cooperation with Mars People. Gen. Morden himself is aboard."
Iron Sentinel MSA idle

The Iron Sentinel a playable unit in Metal Slug Attack. It is the most difficult unit to unlock, as parts are only available for purchase via the Mars Shop.

As Mars Currency can only be obtained by trading in platinum evolved units, free players will have a very hard time obtaining the Sentinel, as their only means of obtaining Mars Points are through the side shops, as they offer Super Rare unit parts. Spenders do not have to worry as much, as it becomes extremely easy to unlock for them.

The Sentinel itself is a very large multi-treaded tank that shoots missiles and projectiles from its ball turret. If MSA Skill small + 4 is unlocked, upon reaching 0 health, it will convert into a second form that shoots even larger missiles with a wide area of effect and dealing much more damage.Attacks

Long Range

Attribute grenade Missile (Spread) - Launches a salvo of missiles from its side. If in second form, shoots out very large missiles.

Special

Attribute grenade Big Missile (Spread) - Fires larger missiles from its main turret, and bombs from its side.

Stats

Health Attribute Resistance
Lvl MSA dot I MSA dot II MSA dot III MSA dot IV MSA dot V Attribute pistol
Kinetic
MSA resistance 1-Increased Increased
1 20000 22000 24200 26620 29282
10 30000 33000 36300 39930 43923 Attribute grenade
Explosive
MSA resistance 1-Increased Increased
20 40000 44000 48400 53240 58564
30 50000 55000 60500 66550 73205 Attribute fire
Incendiary
MSA resistance 2-Normal Normal
40 60000 66000 72600 79860 87846
50 70000 77000 84700 93170 102487 * HP might be increased by skills / items or buffs

Items

The Iron Sentinel uses a selection of unique items unavailable to any other units. Like the parts for the Sentinel itself, these can only be obtained via the Mars Shop (or fused using other items from the same).

Icon Name Stat Effects Components MSA currency Mars Points
MSA item III Rebar Rebar

Production +5
Movement +0.05
Load +5

× 300
MSA item III Morden Symbol Morden
Symbol

HP +500
Resist +5
[Far][Special] Distance +5

× 300
MSA item IV Mars Energy Mars
Energy

Production +15
Movement +0.10
Load +10

× 5,000
MSA item IV Battery Battery

HP +1,000
Resist +10
[Far][Special] Distance +10

x50: MSA item III Rebar MSA item III Morden Symbol

×
MSA item V Missile Missile

Production +30
Movement +0.15
Load +15

× 50,000
MSA item V Big Missile Big
Missile

HP +1,500
Resist +15
[Far][Special] Distance +15

x30: MSA item IV Mars Energy x3: MSA item V Missile

×

Skills

MSA item I Gnome Bullet MSA item I Bread MSA item I Mushroom MSA Skill small + Strengthen Weapons

Strengthen all attack power by (20%, +1% each level).

MSA item III Rebar MSA item III Rebar MSA item III Morden Symbol

MSA item II Flame Shot MSA item II Apple MSA item II Doll MSA Skill small + All-Around Armor

HP will increase by (20%, +1% each level).

MSA item III Morden Symbol MSA item III Morden Symbol MSA item IV Mars Energy

MSA item III Drop Shot MSA item III Fish MSA item III Fruit MSA Skill small + Equip Anti-Armor

Critical rate for all attacks will become (10%, +0.5% each level).

MSA item IV Mars Energy MSA item IV Battery MSA item IV Battery

MSA item IV Big Flame Shot MSA item IV Bird's Nest MSA item IV Shield MSA Skill small + FORM CHANGE

Even if beaten once, gets back to life and turns in 2nd form via HP (20%, +1.6% each level).

MSA item V Missile MSA item V Missile MSA item V Missile

MSA item V Zantetsu Sword MSA item V Holy Water MSA item V Pants
MSA item V Big Missile MSA item V Big Missile MSA item V Big Missile

Purchase Cost

In order to obtain parts for the Iron Sentinel, surplus parts from platinum-framed units must be traded in at the Mars Shop:

1,000 points are required per Sentinel part. Hence:

  • 1,000x Unit Parts (Normal) grants one Sentinel part.
  • 100x Unit Parts (Rare) grants one Sentinel part.
  • 25x Unit Parts (Super Rare) grants one Sentinel part.

Building on that:

  • 80,000x (Normal parts), 8,000x (Rare parts), or 2,000x (Super Rare parts) grants a silver Sentinel.
  • 180,000x (Normal parts), 18,000x (Rare parts), or 4,500x (Super Rare parts) grants a gold Sentinel.
  • 330,000x (Normal parts), 33,000x (Rare parts), or 8,250x (Super Rare parts) grants a platinum Sentinel.

Furthermore, various items for the Sentinel must also be purchased using Mars Points:

  • 900x (Normal parts), 90x (Rare parts), or 23x (Super Rare parts) grants the first skill.
  • 6,500x (Normal parts), 650x (Rare parts), or 163x (Super Rare parts) grants the second skill.
  • 71,500x (Normal parts), 7,150x (Rare parts), or 1,788x (Super Rare parts) grants the third skill.
  • 221,500x (Normal parts), 22,150x (Rare parts), or 5538x (Super Rare parts) grants the fourth skill.
  • 1,121,500x (Normal parts), 112,150x (Rare parts), or 28,038x (Super Rare parts) fills the fifth panel set.

1,451,500 Mars Points are required to fully evolve and equip an Iron Sentinel (or 36,288 Super Rare unit parts). On the other hand, a silver Sentinel with only the first four skill panels unlocked costs a relatively low 80,000 + 221,500 = 301,500 Points (7,538 SR parts).

One can easily gain massive amounts of the items by hoarding up Battle/Guild Medals and Gold Bars from Battles, Guilds and P.O.W. Rescue. From the respective shops, buy only Super Rare unit parts (e.g Stone Turtle, Leona, etc.), as they provide the best ratio for Iron Sentinel parts compared to Rare and Normal rarity units. It is even better to purchase the Super Rare unit parts during a discount event, where the items are sold at 30% off their original price (so the parts would cost 350 of their respective currency). Since waiting for the stores to restock manually can be time consuming and unnecessary, it is best to continually refresh the stores' stocks and purchase Super Rare unit parts.

Trivia

  • The Iron Sentinel is instead referred to as the "Iron Slider" within Metal Slug Attack's code. Its sprite sheet portrays the original Slider from Metal Slug 6, angled downhill - the game rotates its images to a levelled orientation at run-time.
  • The Iron Sentinel was buffed as of the 2.13.0 update, following player complaints about how weak it was for the time it took to use it properly.
Metal Slug Attack Units
MSA faction Regular Army Soldier | Utan | Marco | Tarma | Hyakutaro | 7000000taro | Eri | Fio | Nadia | SV-Camel | Ostrich Slug | Slugnoid | 6000000taro | Trevor | 8000000taro | Fio(Monkey) | Nadia(Monkey) | Marco(Monkey) | Trevor(Monkey) | Walter Rian | Tyra Elson | Regular Rocket Bomb Soldier | Pocket Marco | Trevor (Mummy) | Fat Tarma | Slug Mobile | Donkey Slug | Motorbike P.O.W. | Motorbike P.O.W. Ver.2 | Fat Eri | Bradley | Zombie Eri | Donkey Slug (Eri) | Fat Marco | Fat Fio | Anna Wiese | Snowwoman Nadia | Red Eye | Gimlet | Roberto Nicola | Ostrich Slug (Clark) | Slugnoid Type-B | Drill Slug | Zombie Nadia | Zombie Fio | Halloween Whip | Everlasting Summer Nadia | Special Trevor | Alisa Stewart | Nathalie Neo | Drill Slug Ver.2 | Slug Copter | Airbone Metal Claw | Slugnoid Type-Ikari | Zombie Tarma | Zombie Trevor | Metal Claw | SV-001 Experimental | SV-001 | Slug Armor | Everlasting Summer Rumi | Everlasting Summer Madoka | Protogunner | Elephant Slug | Special Eri | Everlasting Summer Eri | Christmas Eri | Everlasting Summer Fio | Special Nadia | Whip | Valentine Nadia | Leona | "Cat Ears" Leona | Clark | Ralf | Rumi Aikawa | Christmas Fio | MS-Alice | MSA (Marco) | Zombie Marco | Midori | SV-001 Type-R(Marco) | Madoka Aikawa | Jet Clark | Crazy Ralf | Lightning Fio | Orochi Leona | Slug Flyer | Regular Army Helicopter MKII | Regular Army Helicopter | Slug Gunner | Heidern | Augensterm | Elephant Slug (Battery) | Deformed Slug Gunner | Super Devil Tarma | Super Devil Marco | Super Devil Eri | Slug Gigant | Slug Gigant MK II | Rootmars Slug
MSA faction Rebel Army Rebel Infantry | Bazooka Soldier | Shielded Soldier | Rebel Rifleman | Paratrooper | Bikers | Rocket Bomb Soldier | Mortar | Arabian Soldier | Girida-O | F.Rebel Infantry | Gatling Soldier | LV Armor | MH-6 s | M-15A Bradley | Iron Iso | Di-Cokka | Arabian Fighter | Rebel Infantry (Wrath) | W.Soldier | Elite Arabian Fighter | Cabrakan Pod (Individual) | Mortar (Wrath) | Bazooka Soldier(Wrath) | Rebel Rifleman(Wrath) | Camel Rider | Flying Tara+ | Bodyguard (Rebel Infantry) | Bodyguard (Shielded Soldier) | Abul Abbas | Bodyguard (Rebel Rifleman) | Shielded Soldier(Wrath) | Dararin Dara Dara | MH-6 s Ver.F | Patrol Robot+ | Eaca-B | Scrap Cannon | Patrol Robot | Iron Iso II | Rebel Walker | Elite Arabian Camel Rider | Balor | Nop-03 Sarubia | Regimental MH-6 s | Girida-O Ver.F | Morden Bus | T-2B Melty Honey | Airborne Melty Honey | Elite Arabian Soldier | Special Abul Abbas | Big Gate | R-Shobu | R-Shobu Ver.F | R.R-Shobu | Subway | Special Vita | Everlasting Summer Abigail | Special Beatriz | Everlasting Summer Beatriz | Allen O'Neil | Formor | Parachuetruck | Mini Jupiter King | Aisha | Vita | Navy | Huracan | Gen.Morden Ver.Di-Cokka | Karn MK II | Nova | Shoe MK II | Shizuka | Shoe | Karn | Destrade | Beatriz | Rapid | Abigail | Iron Nokana | Hairbuster Riberts | Jupiter King MK II | Allen Jr. | Spacey Nokana | Iron Nokana MK II | Allen O'Neil (Wrath) | Hi-Do | Assy Nero MKII | The Keesi II | The Keesi III | Cabrakan MK II | Iron Vermilion | Emain Macha | Drache Macha | Tiger Macha | Jupiter King | Big Shiee | Dragon Nosuke+ | Bull Drill | Sergeant Drill | Rebel Gigant MK II | Iron Cab | Red Devil Morden | Hodumi+ | Crablops Type-F | Assy Nero | Rebel Gigant | Tani Oh | Donald Morden | Iron Sentinel | Crablops | Cabrakan | Kraken | Union
MSA faction Ptolemaic Army Guerrilla | Bazooka Guerrilla | Shielded Guerrilla | Guerrilla Mortar | Sniper | Special Force | Special Force (Rider) | Hover Units | Girida-O Ver. P.M. | Di-Cokka Ver. P.M. | Gunner Unit | MG Unit | Claw Unit | Flying Tara Ver. P.M. | Gunner Unit(Abyss) | Custom Vehicle | Hover Vehicle | A.P.C. (Special Force) | MH-6 s VER(P.M) | Guerrilla (Captain) | Sarubia II Ver.P.M | Ptolemaic Slug EX | Masked Soldier | Masked Soldier (Curse) | Special Caroline | Elite Hover Unit | Commander | Bradley Ver. P.M. | Sarubia Ver. P.M. | Special Dragunov | Ptolemaic Slug | Commander (Navy) | Elite Sniper | ShootingRay | Black Hound | Everlasting Summer Dragunov | Halloween Caroline | R-Shobu Ver. P.M. | Everlasting Summer Yoshino | Sisilia | Yoshino | Towa | Caroline | Veronica | Mira | Dragunov | Augensterm Ver(P.M) | Caro's Augensterm | Jupiter Queen (P.M.) | Metal Rear | Metal Rear EX | Union 03 Ver.P.M | Deep Sand Marine | Sand Marine | Ptolemaios (Abyss) | Ptolemaios (Curse) | Emerald Turtle | Stone Turtle | Ptolemaios
MSA faction Aliens Zombie (Woman) | Zombie (Man) | Zombie (Fattish Man) | Hopper Mecha | Scientist (Zombie) | Zombie (Rebel Soldier) | Flying Parasite | Mars People | Mini U.F.O. | Invader | Hunter Walker | Mars People Pocket | Clone Eri | UFO Invader | Mini U.F.O. (Secret Ver.) | Tar Man | Mars People Cadre | Halloween People | Vanguard(Type-A) | Ring Laser Mecha | Smasher | Lydia | Golden Hunter Walker | Tar Man (Red) | Tiny UFO Type:A | Flying Core | Mars People (Neo) | Mars People Elite | Clone Fio | Clone Fio (Zombie) | Winged Invader | Party People Elite | Halloween Percier | Ring Laser Mecha(Red) | Crab-Tank | Mars Mecha | Everlasting Summer Odette | Dai-Manji | Monoeye | Professor | Percier | Dark Monoeye | Odette | Annette | Nowan | Clone Abby | Mars Professor | Vanguard | Dai-Manji (Secret Ver.) | Brain Robot | Mars Brain Robot | Monoeye UFO | Rugname | Rootmars | Rugname X
MSA faction Independent Pirate Soldier | Chariot | Samurai Infantry | Chowmein-Conga | Bat | Native | Native (Bird) | Hazmat Soldier | Mutated Soldier | Man Eater | Sasquatch | Halloween Soldier | Japonese Assault Force | Samurai Tanks | Dog Mummy | Mummy | Hunged Mummy | Maggot | Huge Locust | Flying Killers | Samurai Plane | Amadeus Robot | Mini Hermit | Researcher | Pirate Assault Soldier | Pirate Soldier(Ghost) | Amadeus Rifleman | Amadeus Soldier (Shield) | Amadeus Bazooka Soldier | Samurai Infantry (Wrath) | Big Snail | Dangling Snail | Amadeus Corporal | Mummy Cat | Hazmat Soldier(Green) | Mini Caterpillar | Bear | Mummy Generator(Mummy Cat) | Lovely Mummy | Di-Cokka(Amadeus) | Special Amundsen | Ohumein-Conga(Green) | Ohumein-Conga (Red) | Sarubia (Amadeus) | Sol Dae Rokker(Origin) | Skull Snail | Slug Armor ver.yagami | Slug Armor ver.kusanagi | Dangling Huge Ivy | Mummy (Awakening) | Special El Dorado | Huge Ivy | Vatn | Morden Robot | Red Goblin | Scotia Amundsen | El Dorado | Mummy Warrior | Elena | Aileen | Esther | Elysion | Jin | Aswang | Cleopatra | Giant Caterpillar | Mecha Allen | Iron | White Baby (Prototype) | Doctor(Brave Guerrier) | Big John | Jade John | Hi-Do(Amadeus) | Huge Hermit | Skull Hermit | Prototype Iron | Toschka Dalanue II | Pharaoh's Arc | Tyrant Pharaoh | Sol Dae Rokker | Sea Satan+ | Toschka Dalanue | Ghost Shiee | Amadeus Type:γ | Amadeus Type:α | Sol Dae Rokker (Anima)

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