B Duel Infantry is a type A passive skill introduced in Fire Emblem Heroes exclusive to infantry units in the Blue pool; designed to augment Arena scoring.
By default, B Duel Infantry functions identically to HP +5. However, as long as the user is at a 5★ rarity and at level 40, it also alters the character's scoring characteristics for Arena modes to act as if the character had a base stat total of 160-170; depending on skill level.
It can be learned without inheriting by Berkut (Debonair Noble) and Marianne.
Stats[]
| Name | Activation | SP |
|---|---|---|
 B Duel Infantry 1
|
Passive | 70 |
| Effects | - | |
| Users | 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.) | |
| Notes | - | |
| Name | Activation | SP |
|---|---|---|
 B Duel Infantry 2
|
Passive | 150 |
| Effects | - | |
| Users | 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.) | |
| Notes | - | |
| Name | Activation | SP |
|---|---|---|
 B Duel Infantry 3
|
Passive | 300 |
| Effects | - | |
| Users | 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.) | |
| Notes | - | |
| Name | Activation | SP |
|---|---|---|
 B Duel Infantry 4
|
Passive | 300 |
| Effects | - | |
| Users | Grants HP +5 & Atn/Spd/Def/Res +2.
If unit is 5*, level 40 and a Legendary or Mythic Hero, and unit’s stats total to less than 175, treats unit’s stats as 175 in modes like Arena. If unit is 5*, level 40, not a Legendary or Mythic Hero and unit’s stats total less than 180, treats unit’s stats as 180 in modes like Arena.Higher-scoring opponents will appear. Stat total calculation excludes any values added by merges and skills. | |
| Notes | - | |
| Fire Emblem | Main Games | Genealogy of the Holy War - Thracia 776 - The Sacred Stones - Path of Radiance - Radiant Dawn - Awakening - Fates (personal) - Echoes: Shadows of Valentia - Three Houses - Engage |
|---|---|---|
| Spin-Off Games | Heroes - Warriors - Warriors: Three Hopes - Tokyo Mirage Sessions ♯FE | |
| TearRing Saga | Utna Heroes Saga - Berwick Saga | |