Link mastery books under skills

[tommytom2k2]

Would be nice if the mastery books were linked under the skill to find their mastery book drops much easier.

Also, the newer mastery books say 20/30 but the old ones say 70%/50%
Bit inconsistent. Unless it's an error carried over from Nexon. Didn't check.

[Saigo]

I'll have to look into this and see if that's possible to do.

As for the 70%/50% vs 20/30 issue, that is something I intend to update perhaps in the next week or so. So thanks for the reminder!

[tommytom2k2]

bump as a reminder to fix % thing and link them.

would also like to mention that "Piercing" should actually be "Piercing Arrow" on the mastery books