This challenge pack was inspired by a zombies plugin for 1.15 (I can't remember the author I'm sorry) and the server game MineZ.
Most mobs are replaced by Zombies, and there are new variants.

• Speedster - Runs as fast as a player
• Strength - More attack power
• Sick - Nearby players receive Slowness I
• Splitter - Splits into two new zombies when defeated
• Transporter - After a certain amount of time, teleports the farthest zombie to it
• Suplex - Picks up players
• Blaze - Sets players on fire
• Axezombie - Carries Stone Axes
• Mounter - Mounts a nearby zombie
• Boomer - Drops a 2 second TNT on death
• Tank - Spawns with 50 HP (aka 25 Hearts)

This pack also adds Infection: A disease you can catch by being attacked by zombies with a 7% chance per hit. Infection deals damage over time, gets more deadly over time, and can only be cured by milk.