Adds Shadowbeatz's L's Theme remix, or better known as the "abyss of darkness song!11!!!"

(CustomOST mod required)

https://youtu.be/xEiMbq_6wpc

Stealth ~ (I didn't know what to put in stealth, so enjoy Claire de Lune)
Control ~ 0:13 - 0:27
Anticipation ~ 0:27 - 1:08
Assault ~ 1:08 - 3:25