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"Skill Check."
The 2nd round of the preliminaries was simple. As Paul and Lisa explained, it's all about learning.
All participants will be transported to a perpetuating room where they need to learn and master a skill; it could be a combat technique, a spell, or an auxiliary art; it could be anything. After learning and mastering the skill, they need to defeat a room guardian to move on to the next room, where the cycle repeats.
The further they go, the more difficult the skills they need to learn become. In addition, the guardian also becomes stronger. One thing to note is that they could only use the skill they learned in that specific room to defeat that room's guardian. If they use any other skills they know, the attempt will be considered a failure, and they'd have to start over again.