The Artifacts submode in Metal Slug Infinity is where the player can upgrade units to increase their versatility.
Information[]
Artifacts are icons representing various units. These icons, every time it's promoted, boosts the stats of the related unit (called Pairsoldier [sic]) by ten levels. Increasing the artifact's grade further boosts the individual unit's stats on the battlefield or at other modes, increases Metal counts, Gold Mine rates, and unit affiliated faction stats. The Battle Speed, Stimpack, and Teleport team buffs can be converted into possession bonuses once the artifact reaches the appropriate grade for the unit who holds said buff. Certain units' attacks and specials are upgraded upon reaching Grade 10.
World Boss Artifacts only increases Medal rewards and damage done to respective World Boss. Aside from the Solar Artifact, Seasonal Artifacts gives boosts outside of unit stats.
Artifact fragments are bought by using Honor Coins, Souls, and Rift Stones. Rift Stones are typically earned through the Battle of Rift, by events, or purchased at the different stores.
Battle of Rift[]
Artifact fragments are also earned through the Battle of Rift. In these battles, a team of 10 units are positioned at the center while hordes of enemy units gang up on both sides. These enemies become bigger in size as the goal limit is closer to being met. Winning a Battle of Rift with a three star rank rewards with Artifact Boxes of the battled unit's faction (previously a battle rewarded artifacts randomly from the stage's reward list). Battle of Rifts are accessed by using Rift Detectors. Stages are unlocked by reaching its specific Artifact Point which is the combined grade of all activated Artifacts.
Artifacts given originally fluctuated between battles. As of 2021/6/17, each completed battle rewards 25 artifacts.
Promotion[]
Artifacts are promoted by collecting a number of Artifact fragments and using Gems and/or Rift Stones. Once an artifact reaches Grade 6, it turns gold and has a more stylized look.
| Grade | Star | Fragments | Gems | Rift Stones |
|---|---|---|---|---|
| 1 | 
|
10 
|
||
| 2 |
|
100
|
200 
|
2,000 
|
| 3 |
|
200
|
4,000
| |
| 4 |
|
300
|
500
|
7,000
|
| 5 |
|
500
|
12,000
| |
| 6 | 
|
600
|
800
|
18,000
|
| 7 |
|
800
|
24,000
| |
| 8 |
|
1,000
|
1,200
|
30,000
|
| 9 |
|
1,200
|
40,000
| |
| 10 |
|
1,400
|
1,800
|
50,000
|
| 11 | 
|
1,500
|
1,000
|
50,000
|
| 12 |
|
1,500
|
1,100
|
50,000
|
| 13 |
|
1,500
|
1,200
|
50,000
|
| 14 |
|
1,500
|
1,300
|
50,000
|
| 15 |
|
1,500
|
1,400
|
50,000
|
| 16 | 
|
2,000
|
1,500
|
50,000
|
| 17 |
|
2,000
|
1,600
|
50,000
|
| 18 |
|
2,000
|
1,700
|
50,000
|
| 19 |
|
2,000
|
1,800
|
50,000
|
| 20 |
|
?
|
?
|
?
|
World Boss Artifacts level up exactly as Soldier Artifacts from Grade 1 to Grade 6 but require more fragments starting from Grade 7.
| Grade | Star | Fragments | Gems | Rift Stones |
|---|---|---|---|---|
| 7 |
|
1,000
|
24,000
| |
| 8 |
|
1,600
|
1,200
|
30,000
|
| 9 |
|
2,500
|
40,000
| |
| 10 |
|
3,800
|
1,800
|
50,000
|