After 115 you stop lvling normaly. At 115 + 50% you gain +1 next to 115 its the same as 116 but you wont gain stats nor skill points just all stat and % Skill Defense making at 115+10 100 all stat and 20% SD. Getting this lvls is slow but they are kind of easy because the first 5 lvls are like 50% each. After those its start going up the % till +10 (900% exp after 115). I went looking for the Info on this new feature but couldn't find anything -_-