No, there is thing called<em>attack combat value</em>in your sheet. It's calculated by combine all your three stats (body, mind and soul) and split it by 3 (round up) and there you get base modifier for both defense and offense.<br/><br/>Now, you add attributes atop this value. If you have combat mastery (like Hitomi has) it's universal add to her ability for offense (so it increases overall score). However example your slime case it has ranged attack mastery, it does not increase the attack combat value in all situations (only at ranged attacks).<br/><br/>The difference really is that Hitomi's case her attack combat value is 4 but with 2 ranks in combat mastery she has value of 6 (which applies all situations). With slime he has attack combat value of 5, but with 2 ranks in ranged combat mastery, in rolling dice you add +2 to it when it does ranged attacks. I should had probably written inside () lines 'has +7 modifier in ranged attacks' or such for your slime.