Lock-on Filter
From Ephinea PSO Wiki
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Lock-on Filter is a rare tool. It may be used on the weapons 
Heaven Punisher and Mille Marteaux to enable them to use their "auto-aim" special attack regardless of the current beat time.
To apply the filter, equip a compatible piece of equipment, and use the Lock-on Filter in the inventory. A weapon with the Lock-on Filter applied will have its name appended with an asterisk (*), and also have "Style: Lock-on" in the item description.
Availability
The Forge
Lock-on Filter can only be obtained by trading the following items to Montague in the quest 
The Forge:
- Ophelie Seize x3
Cursed Cloak x2
Black Ring x1- Striker Plus x2
- Photon Filter x1
Geung-si x1
