| Type | Icon | Name | SP | Required | Description |
|---|---|---|---|---|---|
| A | 
|
R Duel Infantry 1 | 70 | — | Grants HP+3. If unit is 5★ and level 40 and unit's stats total less than 160, treats unit's stats as 160 in modes like Arena. (Higher-scoring opponents will appear. Stat total calculation excludes any values added by merges and skills.) |
|
R Duel Infantry 2 | 150 | R Duel Infantry 1 | Grants HP+4. If unit is 5★ and level 40 and unit's stats total less than 165, treats unit's stats as 165 in modes like Arena. (Higher-scoring opponents will appear. Stat total calculation excludes any values added by merges and skills.) | |
|
R Duel Infantry 3 | 300 | R Duel Infantry 2 | Grants HP+5. If unit is 5★ and level 40 and unit's stats total less than 170, treats unit's stats as 170 in modes like Arena. (Higher-scoring opponents will appear. Stat total calculation excludes any values added by merges and skills.) | |
Cannot use:                     
| |||||
List of owners
| Unit | Skill chain | |||
|---|---|---|---|---|
 | R Duel Infantry 1 5  | R Duel Infantry 2 5 | R Duel Infantry 3 5 | R Duel Infantry 4 5 |
 | R Duel Infantry 1 5 | R Duel Infantry 2 5 | R Duel Infantry 3 5 | – |
In other languages
| Language | Name |
|---|---|
| Japanese | 赤の死闘・歩行 |
| German | R Duell-Inf. |
| Spanish (Europe) | Lid pedestre R |
| Spanish (Latin America) | Lid pedestre R |
| French | Duel infant. (R) |
| Italian | Sfida fanteria R |
| Traditional Chinese (Taiwan) | 赤色死鬥・步行 |
| Portuguese | Duelo inf. Vm |