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Maybe this will help: (Strength OR Melee) + 1d8
Right. So Valeros has Strength d10 and he has Melee: Strength +3
So your best choice is to use his Melee which allows you to roll a d10, add the +3 then add the longsword which gives you another d8.
So Valeros with the Longsword in the Kitchen is d10 +3 +d8