my personal opinion of what the best NWN build is... 16 bard 10 red dragon disciple 14 cleric because you have so many options to destroy people with there are about 20 different variants in which you can make it but the levels stay the same the only thing that changes is what feats you take and the clerical domains I personally found great success with this build because I can use greater sanctuary then I buff up with divine favor and divine power to max out my attack bonus then while your casting true seeing I use a harm then I use a curse song and your dead this build also has word of faith to blind your victim for even more of a bonus to hit (FYI blind fight only stops invisible opponents) for your domains I recommend strength and knowledge you don't need to take the trickery domain because you already get imp invisibility from your bard levels your stats start like this
Race: Human
16 STR
8 DEX
10 CON
15 WIS
12 INT
14 CHA
there is no need to take 2 points in Charisma because you already get 2 CHA from RDD the first 2 things you should take are 2 points in wisdom to get 7th level cleric spells then from there just put all the rest of the points into the STR stat you take divine shield don't bother with divine might you will not have enough feats for this because you need still spell weapon focus imp critical heavy armor proficiency curse song and power attack so that you can get divine shield start 1 cleric and take power attack and divine shield on the first 2 feats then go 4 bard on your 4th level of bard take 8 points in LORE and go 10 RDD, from there go 13 cleric then 15 bard levels to finish it off you can easily get 50 strength with +12 bonus from items I warn you now that this build only has 3 Attacks Per Round but divine power fixes this because it gives you 1 extra APR in campaign naked and buffed with maxed out STR and no weapon I had 64 AB and my Ac is very high because of heavy armor tower shield divine shield and bard song for AB just use War cry from bard levels divine favor divine power if you try and use bless aid and prayer in PVP it would take way to long first thing I use is divine shield and bard song then curse song then I go from there
People like to argue that all your AB is dispellable and that's the major flaw in the build but they only say that until you shove a Word of Faith down there throat with a darkness and a harm on top of it and a curse song to finish them off in 3 seconds but that's not the only way you can win
its impractical to try and take devastating critical on this build but you can do it you can also take the magic domain so that you can use negative energy burst and then balagarns iron horn combination to PWN dex based builds