Not necessarily Jewish "items," but have you thought of playing with some of the King Solomon myths? There is a lot of parlying with demons in them.
Ive decided that i think solomon would best be described as either a 9th level domain wizard (not QUITE sure which domain but ive got it narrowed down to just a few) 3rd level bard or a 9th level mystic theurge 3rd level bard.
David is more like...9th level bard 3rd level paladin. That combo isnt anything to laugh at. Its actually a far more powerful paladin than a pure paladin of the same total level. It will skewer that other paladin. Oh. That reminds me. After david had some actual military experience his primary weapon was unquestionably a spear. So his weapon of choice is spear. He is proficient with harp but he is going to be the bardic variant that can also use his voice all om its own. Also hes a giant (not the race). Were gonna say hes just slightly over 8 feet, because mythologically david was actually super tall to the point that he was tall even compared to saul and saul was all ready considered a giant. Im giving david the large size category. But hes at the very bottom of it. Just a whisker above minimum height requirement.
I would hate to fight david. Guy who can cast gaseous form and other powerful effects all day, is a giant, can debuff me all day, and weilds a spear decides i need to die? Im noping right out of there.
And he has the leadership feat and not only a spec ops force (mostly highly talented spear users. Id probably stat them as really well built knight classes) famous throughout the land but hes also got a freaking army.
Im double noping outta there. I would not wanna face A MAGICAL ROCKSTAR palidin who is a giant (not the race) and has access to a butt load of major magical items. SO MANY. Not to mention they are the favorite two humans of the irl equivalent of pelor if pelor also had the war domain.
His son is not much less scary. Still has the army too.
All in all, id rather face most individuals of most classes who are personally level 20 than either of these two.
think either david or solomon would have to be considered a nasty foe. Good thing they're good aligned. Oh wait. Im NE...