| Type | Icon | Name | SP | Required | Description |
|---|---|---|---|---|---|
| B | 
|
Blue Lion Rule | 300 | — | If unit's Def > foe's Def, reduces damage from attacks during combat and from area-of-effect Specials (excluding Røkkr area-of-effect Specials) by percentage=difference between stats × 4 (max 40%), and also if foe initiates combat, unit makes a guaranteed follow-up attack. |
| This skill can only be equipped by its original unit. | |||||
* Unused restrictions: No restrictions.
Effects[]
| Effects | Targets | Conditions |
|---|---|---|
| Combat effects | ||
 Reduces damage by X% (max: 40%)X = 4 x (  Unit's Def -  Foe's Def)from attacks & Non-Røkkr AoE Specials | Unit | Unit's Def > Foe's Def |
 Guaranteed follow-up | Enemy Phase & Unit's Def> Foe's Def | |
Notes[]
- The non-Special "reduces damage by X%" effect is calculated after offensive Specials and damage boosting effects such as
Arcane Lúin and Dominance.
- If a skill such as Miracle or Everliving Domain can trigger, the damage-reduction effect will not trigger and the user will still survive with only 1 HP.
- Umbra Burst weapons will always deal a minimum of 1 damage even if the foe is equipped with
Invincible Sister, 
Vengeful God, Invincibility Seals, or damage reduction effects. - "Reduces damage by X%" effects stack multiplicatively, unlike interactions related to the weapon-triangle, such as Triangle Adept and the weapon-triangle advantage boost.
- Non-Special "reduces damage by X%" effects can be neutralized or reduced only during combat by effects such as Share Spoils+ or Halves non-Special damage reduction.
- For more information, see Damage calculation.
- If a skill such as
- The Area-of-effect Special damage-reduction effect is calculated after Area-of-effect Specials and damage boosting effects that trigger before combat such as Treachery and Dominance.
- Røkkr area-of-effect Specials will always deal out of combat damage even if the foe is equipped with Invincibility Seals or damage reduction effects.
- "Reduces damage by X%" effects stack multiplicatively, unlike interactions related to the weapon-triangle, such as Triangle Adept and the weapon-triangle advantage boost.
- Non-Special "reduces damage by X%" effects that reduce damage from Area-of-effect Specials can be neutralized or reduced only out of combat.
- For more information, see Damage calculation.
- "If foe initiates combat" means if a foe triggers combat during the enemy phase. The unit being initiated upon does not need to deal damage, nor be able to counterattack.
- However, if the effect is applied after combat, the unit being initiated upon must also survive it to fulfill this condition.
- As a general rule, if a unit is both prevented from making, and guaranteed to make a follow-up attack, the effects cancel out, and the Spd difference decides instead (including effects that alter the Spd difference such as Frozen).
- A foe with effects such as Phys. Null Follow or Null Follow-Up will neutralize the guaranteed follow-up attack granted by Blue Lion Rule.
List of owners[]
| Unit | Skill chain |
|---|---|
 | Blue Lion Rule 5  |
In other languages[]
| Language | Name |
|---|---|
| Japanese | 蒼き獅子王 |
| German | Löwenherrschaft |
| Spanish (Europe) | Mandato félido |
| Spanish (Latin America) | Mandato félido |
| French | Règne de saphir |
| Italian | Dominio Leoni |
| Traditional Chinese (Taiwan) | 青獅子王 |
| Portuguese | Domínio Leão |