Ancient Law

This article's name isn't actually the official subject's name, but will be used as a quick reference until SNK is kind enough to provide us the official name.

"Ancient Law" is the final mission of Metal Slug 6. This mission can only be accessed on Hard Mode.

Mission Synopsis

The Regular Army, Rebels, and Mars People have all arrived at the main impact site of the Invaders. With the hideout fully excavated, the three armies begin their assault. The Invaders are hidden much deeper, so a couple of Slug Diggers are used to dig their way in. This leads to the Invaders' hive, a wide open cave full of organic terrain that houses captured Mars People in pods. At the end of the cave is some sort of chamber that houses their leader, the Invader King.

Meanwhile, a member of the Regular Army not controlled by the players drops down with them. This soldier seems a bit impatient haven taken a Slug Digger first and traveled way farther than the rest of the armies. Unsurprisingly, a group of Flying Parasites ambush and possess the soldier. Killing the green parasite snaps them out of it. Gameplay-wise, this character becomes unavailable for the entire mission.

Once the Invader King is defeated, the chamber's floors all collapse and everyone goes into free-fall. The heroes grab onto a wall while the Invader King falls to its death. The massive explosion blinds the heroes and causes them to lose their grip. Depending on the route taken in Mission 4, Morden or Rootmars saves them at the last moment.

Locations

Excavated Tunnel: The main route fully guarded by the Invaders. Grenade Soldiers and Gatling Soldiers help out the players. The Slug Digger is found at the end.
Digging Site: Soft dirt that can be burrowed through. Space Mole Crickets come from above and below and hidden landmines shoot out pile bunkers from the sides. Should the Slug Digger be destroyed, the player is immediately killed.
Organic Tunnel: A purplish-pink and bubbly tunnel with Hunter Walkers walking on the ceiling. POWs start appearing here.
Organic Cave: The main resort for the Invaders. The Controller is found at the very end. Rescuing the possessed soldier drops an SV-001 Type-R for use on the next area.
Chamber: Vertical tunnel with pulsating terrain. The Invader King is found inside of a cocoon producing various Invaders.

Prisoner Locations

There are 20 POWs in this mission.

Metal Slug 6
Heroes	Marco Rossi • Tarma Roving • Eri Kasamoto • Fio Germi • Ralf Jones • Clark Still
NPCs	Riviera von Wittenberg • Maryell von Wittenberg • POW • Rumi Aikawa • Madoka Aikawa • Hyakutaro Ichimonji • Donald Morden • Rebel Army • Chinese Soldier • Martians • Rootmars • Invaders • Announcer • Parker • Pupipi
Enemies	Fanatics • Grenade Soldier • Bazooka Soldier • Shielded Soldier • Rebel Rifleman • Mortar • Gatling Soldier • Hunters • Mars People • Mini-UFO • Invader Infantry • Winged Invader • Flying Parasite • Hunter Walker • Giant Hunter Walker • Space Mole Cricket • Crab-Tank • Vanguard • Smasher • Invader UFO • Flying Shelt • Flying Core • Flying Killer • Maggot
Enemy Vehicles	Di-Cokka • T-2B Melty Honey • MV-280C • Nop-03 Sarubia • Girida-O • M-15A • M34 3-Ton Truck • Walking Locomotive • R-Shobu • MH-6S Masknell
Bosses	Bull Drill • Iron Sentinel • Brain Robot • Elder Centipede • Invader King Mini-Bosses: Controller
Weapons	Heavy Machine Gun • Rocket Launcher • Shotgun • Flame Shot • Enemy Chaser • Iron Lizard • Super Grenade • Drop Shot • Two Machine Guns • Zantetsu Sword • Grenade • Fire Bomb
Slugs	SV-001 (Type-R) • Slug Flyer • Donkey Slug • Protogunner • Rootmars Slug • Slug Digger
Missions	African Winds • The Illusion of El Dorado • Asian Impact • Golden Bridge is Falling Down • Ancient Law
Other	Combat School • Weapon Stock • Rush Blaster System • Crane

Spin-Offs
Missions
Main Series
Metal Slug	Absolute Thick Forest • A Wish For a Morning Glow • Iron Cavalrymen in Hell • Death Valley • The City Under Despotism • The Memorial Sea
Metal Slug 2/X	Drifting in Desert • Monument of Depression • Madrigal of Wind • Return to Hong-Kong • Kiss in the Dark • I Wish to Believe in Love
Metal Slug 3	A Couple's Love Land • Wandering at Midnight • Eyes Over the Waves • Tombstone of Sand • All About Love
Metal Slug 4	Let's Run Through! • Show Spirit • Snowy Road • Cadaverous • Go Ahead! • Secret Place
Metal Slug 5	Heavy African • Windy Day • Intrigue • Run Through • Last Ditch Resistance
Metal Slug 6	African Winds • The Illusion of El Dorado • Asian Impact • Golden Bridge is Falling Down • Ancient Law
Metal Slug 7/XX	Scrap Island • Coal Mine • Underground Fortress • The Waterfall • Ruins Base • Snowy Country • The Beginning is the End
Metal Slug: 1st Mission	Emergency Mobilization • Hurry On • Slicing Through the Jungle • Battle in the City • Underground Battle Pass • Pursuit of the Transport Train • Penetration of the Front Base • Discovery of the Front Base • Forced Escape • Discovery of a Secret Passage • Night Flight • Fortress • Weapons Dump • Invasion in the Sea of Trees • Weapons Port • Breakthrough: With Prejudice • Fierce Battle
Metal Slug: 2nd Mission	The Front Line • Invasion • Dire Straits • Dangerous Descent • Battlefield Bridge • Turbulent Transmissions • Fatal Express • War-Torn City • Shot Down • Terrain Carrier • Camouflage • Save All Hostages! • Hostage Rescue • Reckless Reactor • Into the Fray • Intelligence • Contact • Pursuit • Betrayal • The Enemy Below • Deadly Assault • One Fell Stroke • The Tundra King • The Ice Queen • Free Fall • Decoy Strategy • The Desert • Unearthly Silence • Close Combat • Crossed Paths • The Fortress • Ocean Depths • Breakthrough • The Stronghold • Menace Out of the Skies • The Jet Stream • Lone Assault • Termination
Metal Slug Advance	Mission 1 • Mission 2 • Mission 3 • Mission 4 • Mission 5 • Dungeon
Metal Slug 3D	Start from Mountain Village • Be Headquartered in the City • Desert Town • Coal Mine Mark • Underground Ruins • Atmospheric Discharge • Break the Barrier • Sink Under the Waves • The South Pole • Climb the Tower • Out of Control