This is a 1.12.2 Forge coremod.
- Change the percentage of villages that are zombie villages
- Invert the check, so that only e.g. 5% of villages aren't zombie villages.
Made for some guy on reddit.
Can you imagine being stupid enough to release a mod (for any game, not only Minecraft) and not post the source code under a permissive or copyleft license? I can't.
Anyway it's MPL-2.0