A little backstory:
Lucius is a LE assassin (2e-3e hybrid). He grew up in refugee camps, having first fled Geoff with his mother and abusive father, ending up in the Shieldlands. It was there he (long story for another time) came to understand the *finality* of death, and murder's ability to 'solve problems'. Specifically the one his mother was having with his father.
After fleeing the Shieldlands, he grew up near Knulb, and started 'work' for the Nine Sisters at a young age. It was in Knulb that he became fanatically devoted to the doctrines of St. Cuthbert. The Cuthbertians recruited heavily out of the refugee camps, and Lucius was a sucker for their doctrine of struggle against Iuz.
He double-tithes, and always asks for Canon Turgeon's advice. As Canon Turgeon, along with Sister Keriann (we'll meet her soon, she's also a Cuthbertian cleric) represent the Lawful Good 'voice of reason', they manage to keep Lucius in line.
It made for some damn fun role-play, with a LG and a LE both professing devotion to the same church doctrine, but twisting it to their own ethos. Of course, in the end, Lucius would always humbly defer to the Canon. His defrence (bordering on obsequiousness) was also generally hilarious, because everyone else *despised* the Canon. So Lucius would show up with 'instructions' from the Canon, and try to press that agenda. Over the course of days, those 'instructions' would degrade, becoming more and more evil.
Day 1:
Lucius: "The Canon says we should ask those guys if they saw anything."
Party: "F*** the Canon. Shut up, Lucius."
Day 2:
Lucius: "The Canon said we should interrogate those guys."
Party: "F*** the Canon. Shut up, Lucius."
Day 3:
Lucius: "The Canon wants me to capture those bastards and cut them until they talk."
Party: "We'd better get back into the dungeon now."
Lucius was very strongly of the belief that total unity is the only means through which the small group could oppose the Temple. So while he thought the party was handling the politics all wrong, he sublimated his opinion (like a proper fascist) into the party’s decision. Plus, he never really got the free time to go on a killing spree, although he certainly meant to.