| Type | Icon | Name | SP | Required | Description |
|---|---|---|---|---|---|
| A | 
|
Heavy Blade 1 | 60 | — | If unit's Atk ≥ foe's Atk+5, grants Special cooldown charge +1 per unit's attack. (Only highest value applied. Does not stack.) |
|
Heavy Blade 2 | 120 | Heavy Blade 1 | If unit's Atk ≥ foe's Atk+3, grants Special cooldown charge +1 per unit's attack. (Only highest value applied. Does not stack.) | |
|
Heavy Blade 3 | 240 | Heavy Blade 2 | If unit's Atk > foe's Atk, grants Special cooldown charge +1 per unit's attack. (Only highest value applied. Does not stack.) | |
Cannot use: 
| |||||
Available as a Sacred Seal.
Notes
- Only attacks performed by the unit carrying this skill grant +1 Special cooldown charge. This is true regardless of which who initiated combat.
List of Heroes with Heavy Blade
| Unit | Skill chain | |||
|---|---|---|---|---|
 | Heavy Blade 1 5  | Heavy Blade 2 5 | Heavy Blade 3 5 | Heavy Blade 4 5 |
 | Heavy Blade 1 4  | Heavy Blade 2 4 | Heavy Blade 3 5 | – |
 | Heavy Blade 1 5 | Heavy Blade 2 5 | Heavy Blade 3 5 | – |
 | Heavy Blade 1 3  | Heavy Blade 2 4 | Heavy Blade 3 5 | – |
 | Heavy Blade 1 5 | Heavy Blade 2 5 | Heavy Blade 3 5 | Heavy Blade 4 5 |
Seal acquired from
Tempest Trials reward
- A Gift of Peace (26 December, 2017 - 9 January, 2018): 40,000 Score.
Sacred Seal Forge
In other languages
| Language | Name |
|---|---|
| Japanese | 剛剣 |
| German | Schwere Klinge |
| Spanish (Europe) | Sable pesado |
| Spanish (Latin America) | Sable pesado |
| French | Lame lourde |
| Italian | Lame grevi |
| Traditional Chinese (Taiwan) | 剛劍 |
| Portuguese | Espada maciça |