The Legend of Heroes: Trails of Cold Steel

S-Break is an ultimate craft which is capable of killing groups of enemies at once. Some characters' 2nd S-Break can be unlocked as the story progresses (but it will replace the 1st S-Break), however you don't necessarily need to wait this long. Simply allow your main character to continue attacking enemies until their CP reaches at least 100 (max is 200). This will allow you to perform the S-break skill by pressing then / / / or using with direction to select the character you want. Do this 100 times in order to unlock the trophy. You can check your progress in Battle Note under Combat Skill - S-Breaks. Master Quartz Force at Level 5 can help a lot since it gives the character who is using it 25 CP for each kill.

If your characters' CP takes a while to reach 100, you can stay in the Inn at small towns (100 Mira each time = 100 CP, but you can take a rest as many times as you want) or Hotel in the big cities (200 Mira each time = 200 CP) to grind for this trophy. I highly recommend you stay in the Inn/Hotel to have 200 CP on every character before advancing in the story. You also can buy food items which have CP recovery for emergency case.