While I agree that a high level Mage would probably win a battle with a Cleric, Clerics are essential to your party. Their protection spells give my tanks almost total immunity (protection from fire, lightning, free action, death ward, negative plane protection, caotic commands), bring on the bad guys. They can also be used as front line fighters (draw upon holy might, armor of faith, haste), for those times when the enemy warps in all around your party and you need to protect that all so powerfull mage when he is at his most vulnerable.
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\"Here once was light, that the Valar begrudged to Middle-earth, but now dark levels all. Shall we mourn here deedless forever, a shadow-folk, mist haunting, dripping vain tears in the thankless sea?\"<br />Feanor at Tirion upon Tuna, Of the Flight of the Noldor, The Silmarillion
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