Hello everybody! We have tons of new awards for the new year that can be requested through our Awards System thanks to Antifa Lockhart! Some are limited-time awards so go claim them before they are gone forever...
As in the Keyblade that appears on the Raid Boss screen? That's the Keyblade the bosses are weak to. If you use that Keyblade to attack the Raid Boss, you'll receive an extra damage referred to as Keyblade bonus on the recap screen.
The Keyblades change every few weeks or so, so be sure to keep abreast with the latest update notice usually posted on the walkthrough thread!
Oh, that! That would be the Keyblade equipped exclusively by the Unicornis Foreteller. As of now it's unobtainable and I don't think it would be obtainable at all.
Each of the other Foretellers has their own Keyblades, too. Those Keyblades match the theme and colour scheme of the patron animal of their respective wielders. You can take a look at those Keyblades here: http://www.khinsider.com/kingdom-hearts-x/keyblades