Thanks for your feedback. ^_^
I have thought about the points you brought up, and here's what I've got.

[quote=@Denalz]
[@Guardian Angel Haruki] 
Before the Edicts of Lumen, the type of behavior you're describing from Sir Brutus would have been much more likely. In present day the actions of Sir Brutus would have had him branded a criminal by the church and removed, not cheered on. If he has an entourage, it would be very difficult to find other Silver Order knights who would be willing to be branded as criminals alongside him. What you're describing sounds more like a group of frat boy malcontents than an organized order of professional knights who have sworn to uphold compassion. Unless Sir Brutus is a complete idiot, he would know that he'd need to leave no survivors to his crime or else run the likely scenario in which he is tried and convicted. [/quote]

Sir Brutus could very well have been an idiot. That's not out of the realm of possibility.

I was thinking more along the lines that he probably would have the confidence to do that sort of thing because of his standing as a Paladin, an embodiment of righteousness, and he is probably a noble himself. Possibly, a noble whose family is helping fund the faith, so doing anything to this paladin means a significant decrease of funds at their disposal. 

In short, He would definitely use the religious quotes and faiths to justify his atrocities. He would also have the knowledge and social savvy on how to evade the consequences of his actions, if he was caught. He could have excused his actions and say something like, "Oh, this kid was infected, so I had to mercy kill him," 

The Silver Order knights (or members of the faith that are of lesser standing) would have corroborated and protected Sir Brutus in order to protect themselves, at the very least. Those members could also have been his friends who agreed with him, or couldn't stand up to him. 

I also imagine that under normal circumstances, Phiolvamea would have died because of Sir Brutus and his entourage. He did take measures to ensure that there were no witnesses. But by chance, by fate, or by divine intervention, Phiolvamea and any other survivors she found managed to live through the event. 

[quote=@Denalz]Based on the lore stated in the source books, the religious orders operate in a certain way and therefore would not tolerate this type of behavior. My concern is, based on your character's backstory, you need the church itself to be corrupt rather than a mere stray paladin. Otherwise Im afraid you'll be disappointed when, virtually all people within the church, are behaving entirely different from what you've described above.
[/quote]

For this backstory, I don't think the entire church itself needs to be corrupt; Just bad apples that managed to cleverly enter and navigate the system. 

If the church isn't actually corrupt, then cool! But, Phiolvamea would still have that view of the church being corrupt. Her trust and faith in that religion is just broken by those bad apples. The idea of getting rid of corrupt churches may sound great to her, but Phiolvamea knows that that's an impossibility, so there's no point in trying.

Her main goal is to actually do good in the world, and to get rid of the nightmares that plague her. If she can make Sir Brutus pay, that'd be a bonus.