Bacon Bits
Legend
The ones in the example are dedicated melee grunts who do just that. All you need is a lure....
The ones in the example begin adjacent to the Fighter and new ones spawn immediately. Movement isn't considered, so Misty Step, Dimension Door, or Fly are right out. An Evoker with Thunderclap or would do extremely well (3d6 + 5 vs all 8 targets, save DC 17 for half) and any Wizard with Wall of Fire would presumably take out at least 80 for each 4th, 5th, and 6th level spell slot. However, you obviously can't pick a set of spells after the scenario has been revealed. That's just using knowledge you wouldn't possibly have. I mean, given the above scenario, I'd take a Ranger with Horde Breaker and Whirlwind Attack over a Fighter, but that doesn't mean it'd be a fair comparison.