Looking at getting my DM to add these and AlterBars, my only question is how it works with Resistance and systems that have different AC rules? (Or if it does at all, of course.) Calling to the AC seems simple enough, but the issue is a "hit" in our case is one AC under, rather than meeting or succeeding; and Resistance to various types of damage comes up off and on. The third variable is whether there's a qualifier for 'Is this weapon magic or not' in the case of things that require magic weapons to actually hit period.