Board Thread:Questions and Answers/@comment-5149755-20150409001207/@comment-6697950-20150409073828

You can't find anything concrete because there isn't anything concrete to begin with. We only know how many slots a player is given at the very beginning and how many slots certain players had at certain intervals, like at around level 10 or at the end of the game. But there was no detailed explanation on when a player gets more slots. Extra skills assuredly require a skill slot since Nezha had to give up a skill to get Martial Arts. However, we don't know whether a unique skill consumes a skill slot or not. We can only guess.