Best class and/or map for grinding monster count

[Blind]

my only remaining achievement is 1 million mobs; 200 hours in I'm about 1/4 of the way.

I know all the classes pretty well (well, the commodore not AS much, but ehh); and I know the main game pretty well...

But I don't wanna spend another 600 hours.

So, I need map density and clear speed more than anything else. I don't even have to play at the level cap or hard zones; and any summoners or respawning enemies that count would be very useful

[chris.ferrantegerard]

Oh yeah, that achievement sucks so much. I play in short bursts and work my characters through the endless dungeon so it's taking me a long time to get that done. I was playing them on Ridiculous for the challenge so that makes it even slower lol.

To make it go faster, I'd suggest playing on easiest difficulty with a char with Electrode relic. Take the Lightning Storm kill and just run past everything while the relic kill stuff. Do the endless dungeon level where enemies divide on death. Pick levels with goblins as this will give you a lot of weak enemies to mow through. Even better if you roll the infinite respawn modifier, then you can just stick in that level killing stuff. Will still take an insane amount of time to finish but will be a lot faster.