Challenge: "The Walking Dead"

Description:
Legions of the dead invaded Sanctuary. They are faster and stronger than usual.
Nobody survived outside the walls. But perhaps you can do it.
Rules:
Always night. No waypoints for levels.
Five acts and five shards for creating a Challenge Trophy.
The further you go, the stronger the walkers become.
Kill super unique monsters and bosses to get challenge shards.
Act bosses and the bosses in Uber Tristram have the highest drop chance of the shards.
Rewards:
Challenge Trophy - Carl's Eye