there's a great WIKI guide on NWN Wiki. says the minimum number needed to use lvl 9 scrolls, its in the 20's, no sense in going higher good info on builds as well. If i find it ill post a link, UMD is good for using cross class items as well. IE monk boots, and wizard robes. specific rings. special bows and alignment restriction items, cant wield exotics without the feat though.