As for the constitution bit, it was his lavendar eyes, not any extraordinary constitution that allowed him to adapt to daylight. The whole reason for not raising vitality is more to make him more challenging to play than any actual storyline limitation. And, he has always semmed soewhat physically frail to me, somehow. In any case, as I have already stated, a ranged weapon is appropriate if you are dual-classing him with a ranger. And, naturally, he would kill all spiders on sight, as they may be spies of Lolth.