Just an addendum to my last post; It's a misconfiguration in one of the lua files. Thankfully though, as I pointed out and Relics proved via screenshot, you can access it via the minimized skill window.
Unfortunately, Spiral Pierce (in the RE clients with the latest .luas from whoever does the translating) doesn't allow the user to select it, whether maximized or minimized. If anyone knows how to fix either, do let me know, as I'm terrible with the new RE luas apart from adding in customs. <3