Arnold is mostly interested in material properties. For example he really likes to know what is about cold iron that turns it into cold iron and how this cold ironness can be transferred to materials that are more sensible as weapons. He similarly studies silver and wooden stakes too.

His limited practical successes thus far mean he has travelled across Europe to find a chantry where he fits. Particularly because there is really only one way to actually test prototypes. Luckily he now has a ready supply of Sabbath living nearby.