Penn struggled not to fall to his knees in front of the guest Guide who joined their training team, lest he wanted to embarrass himself. Even awakening as an Esper didn't alleviate his gate sickness symptoms. He assumed he still had a few days of rest before they entered another gate - but it seems everything was moved forward at Guide Baek's request.
The team for Penn's training session included himself, Nathan, Summer, Silas, and Yoonseul. The dungeon they chose for training was at a higher level than any of the training dungeons available. An A-ranked swamp-themed dungeon.
Daniel explained that extra gear is needed to enter this dungeon due to its innate nature. There was no solid land within the gate - as it was an active bog. There were some false land patches, but those would sink if too much weight was on them. They also had to be careful since they could not see below the surface, and the depths would change drastically.