u need to beat konquest to get them both....once u beat konquest, lui kang is in the last realm, in the lower right corner, behind a tent, on friday at 12 am.....raiden (once u beat konquest) u get by beating him, in the orderrealm look for him ( E-3 i think), u gotta beat him in order to get him.....he inflicts twice as much damage when u fight him

Lui Kang is in Edenia where Jade ambushes Rain, in that cave, go behind the lil tent, and meditate until thursday at 11pm, a treasure chest will show up at 12am, You have to be quick about it. Raiden is in the Order Realm, (E-3), You gotta fight em. You cant unlock em till you beat Konquest and unlock Shujinko