I was wondering if there is a mod (1.12.2) increasing the number of zombies each nights ?
Which means that I'll begin the adventure with a "vanilla" world and days/weeks (in game) after, there would be 50/100 zombies or more around my place.
No wandering zombies. They will all coming slowly to my location, increasing they're number each day and resisting to the day light.
That would make a normal early game, but, in the end, it would be a nightmare.