Well we have a Titan - Hunter - Warlock sounds pretty fantasy to me so do we need a Healer? or Medic? I would expect to see this in a group to add a strategic element. A balanced group would be stronger. Could a Cleric buff the group or debuff the enemy? Even Borderlands has a healer in the Siren and that is an out and out shoot fest.
Would we want to see this class?
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I don't see why we need a healer. Why limit a classes ability when you can just give the Warlock (for example) all the powers and they have a choice on what they want to specialize in (theoretically).