They found a seemingly safe place and landed there. Jack used his Camouflage Tent to rest for a few hours. The sky of the underworld remained the same whether day or night, but Jack estimated they had been roaming for a full day.
Before resting, Jack spent one hour practicing mana manipulation. When he was prostrating himself at Darmos' place, he didn't just train mana manipulation. He was also shadow-training in manipulating mana to enhance game skills.
Now that he tested it, he knew he was still far from reaching his grandfather's level, but he started to touch that realm already. At his stage, he found it difficult to adjust mana on different skills. So, he focused on training only one skill, Brave Slash.
Brave Slash was his strongest single-target attack with a short cooldown, which was only three minutes. It was also simple in execution, making it an ideal skill to practice on.