Sinon acquired Hecate II after going to the dungeons below SBC Glocken and falling down a chute trap. She ended up in the lowest floor of the dungeon, the place with the highest level of danger, in a stadium-like area. In that room was a strange monster that she had never seen, although she thought that it was probably a boss-class monster. She thus went to an air vent at the top of the stadium and continued to shoot the boss, who was unable to reach her with any of its attacks due to her being too far. She had to make sure that every single bit of ammunition hit the boss's weak-point, since she was almost out of range and thus the damage to the boss would be minimized. After three hours of struggling, the boss dropped a rare piece of equipment that she had never even seen, the «PGM Ultima Ratio Hecate II».