Talk:Skills/@comment-5896096-20130119132530/@comment-5867530-20130123092514

First - Using a RareEX sk1 will give you a 20% chance to upgrade skill for an UR EX from sk1 to sk2. Using a sk3 REx will increase your chance from 20% to 40% the chart says, 20% for Rare so it's (20%/2) * (1+1) for Sk1, and (20%/2)*(3+1) for Sk1.