I'm highly suspicious of the Marauder, and I think he did it.
I suspect the following:
Victim was attacked with controlled ferocity and extreme anger.
The Marauders are known to become frenzied.
Fine, clear, blue dust found on the body of the victim.
Probably from the weapon, an L'Cie Bardiche (see reference image).
It can be wielded by Marauders as low a level as 13.
Area near wounds found to be slightly frozen.
Again, the L'Cie Bardiche fits perfectly.
Multiple slashes by a sharp object on the back of the victim.
In a wild Berzerk fashion, the Marauder has mercilessly attacked the victim as she was trying to flee.
Ninjas often use two weapons when they do battle. So, for this reason; "slashes by a sharp object".
Body was slightly burned due to fire magic. Inflicted post-mortem.
The Ninja tried to save the victim.
Healing magic was detected nearby. Unknown target.
And so did the Conjurer.
How:
While struck with Berzerk, the Marauder has Maimed, and Heavy Swing'd the victim, and as the victim tries to flee, the Marauder has then mercilessly slashed the victim's back, repeatedly.
- Verdict:
Murderer: Ardin Sarbonny, Marauder.
Reason: Uncontrolled rage.
Motive: None.
Weapon: L'Cie Bardiche.
Edit:
Ugh...