It's a cash shopp item, and it seems to be wearable (?) as I see a preview when I hover over it, but my HA doesn't look any different.

It strengthens the line art of the avi and makes it appear thicker.

Puts a black outline around your HA, good if you are using the vanishing cream. :)

[] [] Aaaaaah, subtle! Makes sense why I didn't notice. Thank you both! :)

;; also, it was made to be paired with the for layering and such. c: