I was playing a couple of days ago with the Maskeraith battle sprite and i came across a graphical glitch with the Shadow cloak skill. When you use the skill it sometimes makes a ghostly square around your character and makes some shields show hidden features as well as the Sprites Final Form choices.
I have some picture links below as references;
Hope this helps out.
Edit: the top link is just a bug i came across while playing. Not related to the bug i'm talking about.