Actually, the group does NOT lack an archer... the Kensai is a highly capable ranged attacker using thrown weapons. Just throw two proficiency slots in dagger or axe (you probably know what items I'm talking about)... a third in single weapon style if you want extra critical hits. And, as someone pointed out, the Cleric/Thief can tank pretty well along with the Barbarian until the Kensai gets better AC modifying items.
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->Klutz
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