I was looking up Wiki page for Rune mastery and I couldnt figure out the rune ranking section of the formula:
Success Rate: [51 + SkillLv × 2 + (DEX ÷ 30 + LUK ÷ 10 + JobLv ÷ 10) + RunestoneBonus - RuneRanking]%
Unless the formula is wrong, I just wanted to know how exactly do you get the Rune Ranking or in other words, how do you determine what is Grade C, Grade B, etc?