Originally Posted by
Ryko
Skill merits kick in every 10 levels with the 8th being at 75. This means that it depends on the WS (but usually lies somewhere in the 1-3 level range depending on your skill grade), as I got savage blade on PLD like 5 levels early (compared to when you're supposed to unlock it, only 3 levels ahead of when I would have unlocked it otherwise assuming I already had it) because of it at 66.
To answer your question, it would be 4 merits to get it at 58, you don't get the 6th merit till 60.