Hardmode Boss Rush

Hardmode Boss Rush is an event-type round that costs 250,000 XP to queue. Hardmode Boss Rush, similarly to its weaker counterpart Boss Rush, has 20 waves, but gives 3 rewards at the end, and has 3 special unlocks only obtained through this mode.

Wave Structure
Wave 1: Zombie Boss, Elite Zombie Boss

Wave 2: Nightmare Wraith x3

Wave 3: Necromancer, Golden Necromancer, Super Necromancer

Wave 4: Elite Brute, Elite Super Necromancer

Wave 5: Goblin Boss x2, Big Shambler

Wave 6: Enraged nacker, Elite Mummy x2

Wave 7: Undyne the Undying

Wave 8: Mini Tank, Nightmare Corrupt

Wave 9: nacker, Enraged nacker

Wave 10: Nightmare Gaster

Wave 11: Lux, Slave of Light

Wave 12: Error, Issue, Virus, Glitch

Wave 13: Ruby, Sapphire, Emerald

Wave 14: King Midas

Wave 15: Greed

Wave 16: Chaos

Wave 17: Reaper, Expired Jack

Wave 18: Special Void

Wave 19: Dummy

Wave 20: The Amalgamation

Tips
Bring a Kindness to heal people on low HP, especially boss players.

You will rarely get a moment to rest, so be ready for anything!

Big Shambler will explode on death, dealing 250 damage to everyone in a wide area, so be careful!