Many modern class-based shooters start off at launch with a 4 class system, whether it's Battlefield, Borderlands, or Evolve. These classes usually consist of: a Marksman/Gunslinger (Hunter), Heavy/Gunner (Titan), Healer/Wizard (Warlock), and finally the Tactical/Engineer.
However Destiny has no class that fills the tactical class ideology, so I propose that a 4th class could be implemented into the game without causing too much of an overlap between classes.
What do you think a Cool/Balanced 4th class would be? And what role would this class play?
This would obviously not be in Destiny 1, but in the sequels.
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The class you described is what the hunter is suppose to be. The right name for it would be just Engineer or Combat Engineer. Which the abilities would include constructing turrets or something. That would fill the void you are talking about.