Irvine’s Limit Break is probably the easiest of the Limit Breaks to explain. Select which ammo you want to use and press 
as many times as you can within the time limit. A list of the different ammo available is listed below alone with the effects each of them cause.
Make use of Ifrit’s ability 
Ammo-RF to refine items into ammo for Irvine’s Limit Break. You can also use Quezacotl’s Card Mod ability to modify cards into ammo.
You will need to track down 
Energy Crystals to obtain more Pulse Ammo.
| Ammo | Shot Type | Effect |
|---|---|---|
 Normal Ammo |
Normal Shot | Regular Damage to one enemy. |
| Shotgun Ammo |
Scattered Shot | Regular damage to all enemies. |
| Dark Ammo |
Dark Shot | Regular damage to one opponent (causes Blind). |
| Fire Ammo |
Fire Shot | Fire damage to all enemies. |
| Demolition Ammo |
Canister Shot | Regular damage to one enemy. |
| Normal Ammo |
Quick Shot | Regular damage to one enemy (faster than Normal Shot). |
| AP Ammo |
Armor Shot | Regular damage to one enemy (ignores Defense). |
| Pulse Ammo |
Hyper Shot | Regular damage to one enemy (most powerful). |