I haven’t had any problem with my one-bishop parties in the past… I think the key thing is to use the caster defensively, in a buffing and healing capacity, rather than offensively. In a melee-heavy party, your bishop’s primary duty is to support your fighter-types.
I don’t know what your bishop has trained in, but if you go the mage/priest route you can pick up virtually all of the essential defensive spells and buffs (enchanted blade, magic screen, armorplate, element/soul shield, rest all, etc). Really, all of the essential screens and shields are fourth level or below, so your bishop shouldn’t have too much difficulty learning all of them.
As for Marten’s Bluff… I’ve gone in at eight. The mine tunnels can be a little rough (damn wasps!) but otherwise you should be fine.
And your last question: The lure attracts the attention of wandering creatures (you can use/cast it out of combat), which can help you slip by groups of creatures. In combat, the lure will occasionally distract an opponent. He’ll just stand and stare at it, losing his attacks for the round.
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