We collect some Royal Knight Skills SP Guides in Last Chaos from other websites, please read them in details and get the main points you need. By the way, if you are still in search of cheap last chaos gold, please come here and you feel quite satisfied.
It cost around 550 sp for level 5 - Two Hand Control. The catch to others was that you only got like 125 extra points a kill for 550 sp and you know how long it took in the good ole days to get 550 sp. This was a waste of sp as far as you were concerned for that skill (lastchaos gold). When a Knight is doing 2k of damage that little was not really noticeable now. It is good to get it after you have maxed all other skills now. You have to see what the level 7 does for damage now, but you may doubt much improvement. Same thing with Dark Immunity.
Just feel relax to read ahead of time what the sp cost is for skills. You should get dark immunity and 2 hand control at the last. You have a level 29 (lastchaos money) knight now sp farming, forever, in the