Revan's Infernal Arms get their magic because they are vessels for Infernal Spirits. If Caroline studied his Arms, she would be able to create a weapon with the ability to hold spirits, but not the powers of the weapons themselves. Plus, she wouldn't want to do that, because capturing a spirit is dangerous if your equipment works in the first place, and Caroline would have no idea if the captured spirit would STAY captured, or be bound to her command.