Agent Deathstalker's hat
Though you've put the whole ugly business behind you, somehow you can't bring yourself to throw away Agent Deathstalker's hat. It's a chilling reminder of the adventure you like to call:
It began with a request from Arbiter Daos. He had learned of a crime perpetrated against Arachnos by an elite cell of Malta operatives known as the Scorpion Gang. Arbiter Daos resolved to eliminate them, so he sent you after one of their members: Agent Armortail. You defeated Armortail, and learned the nature of the gang's crime: they had stolen classified information about Project Fury.
Daos next sent you after Agent Dune, who had gone to ground with some allies in the Council. You eliminated Dune, who spoke of the group's leader: Deathstalker, a man he claimed was invincible.
Deathstalker was your next target. You eliminated the Malta agent, but were shocked to discover that you had been sent against Arbiter Daos' own son! Though Daos regretted his actions, he believed he had no choice but to exact Arachnos' vengeance in equal measure against foe and family alike. Your obedience to his cause has resulted in the termination of your relationship with Daos, as he can no longer bear to look at your face.