I've linked some images- the first are the Unions. I notice that there are 20 stars exactly around it. (13 darkness 7 of light?)
Also the symbol in the middle is very curious
Heart and Spikes
Demon Wing
Angel Wing
It reminds me of the No name keyblade (linked below)
And upon further investigation it seems the Oathkeeper and Oblivion are the 2 halfs that make the No Name Keyblade
Any thoughts??
Unions
http://www.khunchainedx.com/w/images/6/62/Union_Station_KHX.png
Oblivion + Oathkeeper
https://www.khwiki.com/File:Oathkeeper_&_Oblivion_KHII.png
No Name Keyblade
https://www.khwiki.com/File:No_Name_KHBBS.png