Updated 09/15/2020. Now it is even faster.Thanks to I ailurophile I for pointing out this change in the comment section.
This is a guide for a quick and easy way to pop this.
What you need:
- Gunner Class
- The map I made for this, wich is called "Unlimited Imagos" ID: 7PWBL7 (altough they are not unlimited)
Sole Survivor card speed things up a little bit, but now it doesn't make that difference.
Start the mentioned hive with only "More Lethal" mutator enabled to speed things even more.
Now you are going to leave the starting tile and wait for your ultimate to fully charge, then enter the safe room to start another chapter. It's important to close the door only after fully charged!!
After that just leave the safe room, wait a few seconds (10s or so) for enemies to spawn and open one of the doors and activate the ultimate. Restart act, rinse and repeat. When you restart act your ult will be fully charged so you don't need to wait anymore.
This will net you about 15 kills each time.
If you are using Sole Survivor the whole process from beginning to end (0 to 100 kills) should take around 5 minutes not considering loading time. If not using Sole Survivor then it may take up to 9 minutes.
Any doubts feel free to ask in the comments or send me a message.
Negative voters please let a comment to let me know where I should improve :)