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The War Books submode in Metal Slug Infinity is where the player boosts and equips specific faction, Slug, and gameplay stats based on their gameplay styles.
Information[]
Leveling up individual War Books
War Books are individual enhancements for entire factions and types of Slugs. Each War Book is leveled up with a specific set of colored 
Books and/or 
Alien Slates. Players earn more books and stones by fighting in the material's respective Boot Camp.
The Boot Camp has a team of six units and their Slugs destroying a specific Boss while enemy units protect it. Stages are unlocked by reaching a specific commander level. Later stages put restrictions such as giving the Boss an elemental type immunity and/or disallow an entire faction from participating.
War Books are first purchased through the store. Unlike other stores, all items are eventually sold out.
Below are the requirements to promote a current grade War Book.
| Grade | Stars | Max Level | Gems | Honor Coins | Requirements |
|---|---|---|---|---|---|
| 1 | 
|
10 | 100 
|
Purchase at Store | |
| 2 |
|
20 | 100 
|
||
| 3 |
|
30 | 200
|
||
| 4 |
|
40 | 200
|
||
| 5 |
|
50 | 300
|
||
| 6 | 
|
80 | 300
|
22 Books at 5 Star
Commander Lv. 25 | |
| 7 |
|
110 | 300
|
500
|
22 Books at 6 Star
Commander Lv. 60 |
| 8 |
|
140 | 300
|
600
|
22 Books at 7 Star
Commander Lv. 100 |
| 9 |
|
170 | 400
|
600
|
22 Books at 8 Star
Commander Lv. 140 |
| 10 |
|
200 | 600
|
1,000
|
22 Books at 9 Star
Commander Lv. 170 |
| 11 | 
|
230 | 800
|
1500
|
22 Books at 10 Star
Commander Lv. 200 |
| 12 |
|
260 | 1000
|
2000
|
22 Books at 11 Star
Commander Lv. 230 |
| 13 |
|
290 | 1200
|
2400
|
22 Books at 12 Star
Commander Lv. 260 |
| 14 |
|
320 | ? | ? | 22 Books at 13 Star
Commander Lv. 290 |
| 15 |
|
? | ? | ? | 22 Books at 14 Star
Commander Lv. 320 |
| 16 | 
|
? | ? | ? | ? |
| 17 |
|
? | ? | ? | ? |
| 18 |
|
? | ? | ? | ? |
| 19 |
|
? | ? | ? | ? |
| 20 |
|
? | ? | ? | ? |
Book Sets[]
War Book sets
There are 65 books in total divided over 13 sets. For 4-book and 6-book sets, every two books equipped awards an additional group bonus. For a 3-book set, all of the books must be equipped for the bonus.
Equipping a book each costs points. Players can increase the Total Cost limit by buying five more points for Gems with the price increasing per purchase and by promoting certain Soldiers. Promoting units with the total expansion buff, such as F. Bazooka Soldier and Mecha Allen, lowers the equipping cost.
| Book | Materials | Stats | Set Bonus |
|---|---|---|---|
| Improvised Agent Guideline |
|
||
| Tarma's Slug Repair Manual |
|
||
| Trevor's Taekondo Manual |
|
||
| Fio's Ammunition Supply Manual |
|
||
| Rumi's Easy Map Reading |
|
||
| Nadia's Diet Guide |
|
| Book | Materials | Stats | Set Bonus |
|---|---|---|---|
| Ralf's Melee Manual |
|
||
| Clark's Wrestling Manual |
|
||
| Madoka's Magic Girl Story |
|
| Book | Materials | Stats | Set Bonus |
|---|---|---|---|
| Ptolemaic Army Commander Manual |
|
||
| Mortar Operation Manual |
|
||
| Arabian Soldier's Scimitar |
|
||
| Kathehirt Base Assault Report |
|
||
| General Morden's War Against Corruption |
|
||
| Ptolemaic Army Special Warfare Manual |
|
| Book | Materials | Stats | Set Bonus |
|---|---|---|---|
| Elite Shield Defense Skills |
|
||
| Sniper Training Manual |
|
||
| Sniper Camouflage Guide |
|
| Book | Materials | Stats | Set Bonus |
|---|---|---|---|
| Arabian Funeral Culture |
|
||
| History of the Arabian Dynasty |
|
||
| Study on the Ancient Arabian Ruins |
|
| Book | Materials | Stats | Set Bonus |
|---|---|---|---|
| Street Battle Manual |
|
||
| Zombie Survival Guide |
|
||
| Zombie Blood Study |
|
||
| Study on Relationship Between Zombie and Monoeye |
|
||
| The Ecology on Huge Locusts |
|
||
| Man Eater Training Manual |
|
| Book | Materials | Stats | Set Bonus |
|---|---|---|---|
| Superconductivity Engine Manual |
|
||
| HVAP Manual |
|
||
| Camel Training Manual |
|
||
| Drill Crusher Manual |
|
||
| Photon Cannon Manual |
|
||
| TIAF 660 Tuning Guide |
|
| Book | Materials | Stats | Set Bonus |
|---|---|---|---|
| Rough Terrain Breakthrough Slug Manual |
|
||
| Pile Bunker Manual |
|
||
| Jet Engine Booster Manual |
|
||
| Prototype Test Report |
|
| Book | Materials | Stats | Set Bonus |
|---|---|---|---|
| VTOL Tactics Manual |
|
||
| Armored Helicopter Attack Skills |
|
||
| Assault Helicopter Attack Skills |
|
||
| Hi-Do Engine Manual |
|
||
| Cryonics Analysis Report |
|
||
| New Morden Armor Report |
|
| Book | Materials | Stats | Set Bonus |
|---|---|---|---|
| Super Heavy Armor Tank Tactics Manual |
|
||
| Iron Iso's Defense Tactics |
|
||
| Large Snowplow Manual |
|
||
| Rebel Gigant Repair Manual |
|
| Book | Materials | Stats | Set Bonus |
|---|---|---|---|
| Nadia's Restaurant Guide |
|
||
| Desert Survival Skills |
|
||
| Marco's Source Analysis Guide |
|
||
| Invader Diet Report |
|
||
| Pets of the Arabian Infantry |
|
||
| Lobster Cookbook |
|
| Book | Materials | Stats | Set Bonus |
|---|---|---|---|
| Teddy Bear Bomb Manual |
|
||
| Eri's EOD Manual |
|
||
| Electrical System Manual |
|
||
| Future Electronic Warfare Manual |
|
||
| Ptolemaic Scripture |
|
||
| Portal Manual |
|
| Book | Materials | Stats | Set Bonus |
|---|---|---|---|
| Electronic Grenade Manual |
|
||
| Understanding and Utilizing Electromagnetic Shields |
|
||
| Laser Bazooka Manual |
|
||
| Mars People Virus Report |
|
||
| Native Javelin Manual |
|
||
| Tiny UFO Flight Manual |
|
Enhancement[]
Enhance War Books Tab
Once all 65 books are promoted to 5 stars, the Enhance War Books tab is unlocked. Here, the player uses Enhancement Stones (earned by daily missions, bought at the World Boss shop for 600 Cores, and one is offered for sale each day for 700 Honor Coins), Honor Coins, and required unit pieces to multiply a War Book's bonuses. A fully enhanced set also multiplies all group bonuses. The player can only enhance two books a day.
The game enhances a War Book at random, and there's a 60% chance that two War Books will be enhanced by one stone; in the third enhancement, this is reduced to 20%. The game always picks the first book of the lowest grade and the second one at any grade, and it's not possible to enhance a given book twice until all other books have been enhanced at least once.
After all 65 books are enhanced three times, the player is now allowed to pick any book of their choosing at the cost of only enhancing one book at a time. Books from the fourth enhancement forward are represented by a purple Enhancement Stone; the player still uses the original blue stones to enhance books. The 5th enhancement is unlocked after 60 books are at 4 Enhance, and the 6th enhancement is unlocked after 55 books are at 5 Enhance.
- 1st Enhancement: 500 Honor Coins
and two Units with 50 Unit Pieces each. - 2nd Enhancement: 700 Honor Coins and three Units with 50 Unit Pieces each.
- 3rd Enhancement: 1000 Honor Coins and four Units with 50 Unit Pieces each.
- 4th Enhancement: 1300 Honor Coins and four Units with 100 Unit Pieces each.
- 5th Enhancement: 1600 Honor Coins and four Units with 150 Unit Pieces each.
- 6th Enhancement: 2000 Honor Coins and four Units with 200 Unit Pieces each.
Enhancement multipliers are as follow:
| Stat | 
|
|
|
|
|
|
|---|---|---|---|---|---|---|
| Attack | x50▲ | x2.5K▲ | x12K▲ | x12.5M▲ | x1.25B▲ | x125B▲ |
| Defense | x50▲ | x2.5K▲ | x12K▲ | x12.5M▲ | x1.25B▲ | x125B▲ |
| Health | x50▲ | x2.5K▲ | x12K▲ | x12.5M▲ | x1.25B▲ | x125B▲ |
| Critical Chance | x1.2▲ | x1.5▲ | x2▲ | x2.8▲ | x4.5▲ | x9▲ |
| Critical Damage | x50▲ | x2.5K▲ | x12K▲ | x12.5M▲ | x1.25B▲ | x125B▲ |
| Gold Mine Gold Reward | x200▲ | x50K▲ | x20M▲ | x20B▲ | x20T▲ | x20Qa▲ |
| Gold Mine Unlock Decrease | x500▼ | x250K▼ | x150M▼ | x150B▼ | x150T▼ | x150Qa▼ |
| Gold Mine Level Up Cost Decrease | x500▼ | x250K▼ | x150M▼ | x150B▼ | x150T▼ | x150Qa▼ |
| Gold Mine Time Decrease | x5▼ | x25▼ | x125▼ | x1,250▼ | x12.5K▼ | x125K▼ |
| Soldier Level Up Cost Decrease | x500▼ | x250K▼ | x125M▼ | x125B▼ | x125T▼ | x125Qa▼ |
| Medal Acquisition upon Return | x1.3▲ | x1.6▲ | x2▲ | x3▲ | x4.5▲ | x6.8▲ |
| Boot Camp Material Reward | x2▲ | x5▲ | x8▲ | x12▲ | x18▲ | x27▲ |
| Slug Camp Data Chip Reward | x2▲ | x3.75▲ | x7▲ | x9.8▲ | x13.7▲ | x19▲ |
| Battle Speed | x1.3▲ | x1.6▲ | x2▲ | x2.25▲ | x2.6▲ | x3▲ |