This is an interesting item, requesting a profile of the item in the item interface and a higher quality inventory image.
Showcase of the platebody in a youtube video, https://www.youtube.com/watch?v=IYFO4n64CRY
H- I've always wondered what would happen if I crushed an air rune. Have this on me.
Info - Horvik quickly takes an air rune and the pestle and mortar in exchange for a mysterious platebody.