Union Series - Yggdra's Theme (All version)
She will strike you down.
Including both of Knight in the Nightmare version as well.
[0:00] Yggdra Union GBA
[0:40] Yggdra Union PSP
[1:22] Yggdra Union OST plus
[2:40] Knight in the Nightmare DS
[3:25] Knight in the Nightmare PSP
[4:11] Gloria Union
Should be note that the PSP version is basically the same as OST Arrange version but not extend.