As for that mod... Just have shadow heart cast her special area-effect stealth spell (don't remember the name... but it makes a circle around her that follows her and effects anyone nearby). Instead of granting those nearby +10 to stealth, it grants an additional +10 prof to Dex, Int and Wis checks. It doesn't effect STR or CON checks, but pretty much everything else. Obviously a bug, but I have been using it to "force the impossible" for a while now. And it is possible others who don't know it is bugged think the game is SOOO EASY and never have issues because... +10 prof to everything all the time will do that.