Anti-Trapper: Bard-10. Focus on casting. Feats:
1: Sanctum Spell (to qualify for Summon Elemental at 9th, and Magic Sensitive at 6th, so you can actually have both feats)
3: Whatever you want. Extend Spell, maybe?
6: Magic Sensitive (to see magical traps) (Complete Mage)
9: Summon Elemental (to trip mechanical traps) (Complete Mage)
Get a Ring of Invisibility, and use it constantly. In combat, you Summon Elemental, and then Bardic Music as much as you can. You stay invisible the entire time. When your elemental dies, you stop bardic music just long enough to replace it.
Meatshield: Bard-10. Focus on casting. Feats:
1: Sanctum Spell (to qualify for Summon Elemental at 9th
3: Spell Focus(Conjouration)
6: Augment Summoning
9: Summon Elemental (Complete Mage)
Get a Ring of Invisibility, and use it constantly. In combat, you Summon Elemental, and start casting mass buff spells for as long as the elemental lasts.
Everyone does the same thing. You have three Trapfinders and Three Meatshields in your party of 6. Everyone goes invisible, constantly, and Summons elementals. The trapfinders look for traps, the Meatshields put mass buffs in their spell repetoir. Traps are handled by
mass murdering sacrificingthe heroic actions of your disposable minionsbrave planar allies.
Oh yes, and make sure everyone grabs at least one sonic damage spell that can affect objects for trashing traps too hard for the elementals to affect. Otherwise, spread your spells out among as many different buffs as you can find.
And have someone do some skillmonkery as well. Everyone buys a wand of CLW, of course.