First get an Action Replay MAX,then if there isnt this game then click on the button that says "add game" then put in Soul Calibur 3 , and heres the master code:

T5R4-XVHD-27GCX
M7X7-GC8A-D2PHK

Then hit "OK" then heres the code for the folder to hold Night Terror in,press "add new code" then type in character activation,heres the code for the folder to hold Night Terror in


CY0G-3JDD-KF8BJ


now,press on "add new code" again,this is the part where you get Night Terror,heres the code


CD6J-D7BC-G6KR0
4MH8-Y6TY-HZYWD
4W4W-47FK-P9REG

only use in VS mode,Soul Arena mode,Practice mode and World Competition mode
also...press SELECT+L2+R2,then he appears on character selection,he takes up the whole rectangle above the characters