Makes shady zombies visible at night, increases speed, makes them harder to hit, and likely to cause you to get swarmed. Has a second mod that simply removed night invisibility from PKs creatures, PKs hates you enough without making things worse. Also, too lazy to go through that many enemies.
Can add to an existing world by modifying the save’s mods.json and adding “visible-scary-shadies” to the list, with a comma behind every entry except the last.
Get it on github