The Challenge Room is a new high-level content system introduced in Nordica.

 Requirements:

         - Minimum Level: 1500

         - Entry Cost: 10x Monster Skull Tokens

 How to Obtain Monster Skull Tokens:

         - Defeat Skull Monsters

         - Each kill has a 50% chance to drop a Monster Skull Token

 Challenge Room Structure:

         - Total of 7 Waves:

         - Waves 1–2: Monster waves

         - Wave 3: Boss fight

         - Waves 4–6: More monster waves

         - Final Wave (7): Boss fight

 Rewards:

         - After each wave, you gain +1 level

         - Progress to the next wave immediately after clearing the previous one

 Cooldown:

         - You have 15 minutes to complete all 7 waves, or you will be teleported out.

         - You can enter the Challenge Room once every 5 hours.