You took this trophy after defeating Indigo in an adventure you like to think of as:
It began with a battle between Captain Mako and Black Scorpion. Both had sent their men to confiscate a shipemnt of arms bound for Nerva Archipelago. A polite interrogation of the combatants revealed that each man believed the other planned to use the weapons against him.
Leery was determined to bring the conflict to a swift resolution. He ordered you to capture Mako and Black Scorpion's assistants, and to bring them to his bargaining table. Having official license to take down highly ranked operatives was a treat, and you defeated Operative Unger and the Tarantula Wren with ease.
Leery interrogated the captured operatives, and found that each had been lulled into suspicion of the information Unger and Wren provided, Leery tracked this individual and sent you to dispose of her. Indigo fought well, but ultimately was no match for your powers. The war between Black Scorpion and Captain Mako has been quelled, for now, and your stock in Arachnos is only rising. It can't be long before Recluse himself is forced to sit up and take notice of you.