Jan is Chaotic Nuetral,and i myself would take Keldorn,him being one of my favourite NPCs
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You should try giving Anomen the Sling of Everard,its what hes using in my current party.If you do take Keldorn id suggest giving him a crossbow,and using him as anti-mage,for his dispel magic,then with proctetion from magic and deathward,bring them down from a range while jaheirah obliterates them in combat.