The Boss Rush challenge is part of the Quest for the Lost Eternia Shards Part 4: Sky City DLC.

The goal of the challenge is to defeat multiple boss monsters within a set amount of time.

This challenge takes place in the Crystalline Dimension.


This challenge is designed similarly to the Monster Fest and Uber Monster Fest challenges. You're given a set amount of time and lives to defeat all of the crystalline bosses in the campaign up through Aquanos. You'll face the bosses in order of appearance and sometimes multiple instances of the same boss at the same time. (2 Demon Lords, 3 Goblin Mechs, 1 Ancient Dragon, 2 Spider Queens, 1 Genie King, and 2 Krakens)

After defeating each boss, you're given time to tend to your defenses, switch equipment, etc... However, you are not allowed to invest mana at any time into your equipment nor deposit mana into the bank.


  • As of patch 7.38c, completion of this challenge now offers the challenge rewards.
  • Players receive the challenge reward and 2 random items upon completion.
  • This challenge is one of the few capable of rewarding pets; Dragon/Tiger.

Challenge Details

Recommended Level: 70 Challenge Information
Number of Crystals Number of Waves
N/A 6
Defense Units Starting Mana
50 3200
Hazards Mana Per Round
Falling Off Map 3200
Spawn List
DemonLordIcon GoblinMechIcon AncientDragonIcon SpiderQueenIcon Geniekingicon KrakenIcon
Easy Medium Hard Insane Nightmare
Monk Punk Glaive Monk Punk Glaive Monk Punk Glaive Classic's Eagle Crested Standard Classic's Eagle Crested Standard
Easy Medium Hard Insane Nightmare
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