A Grave?!

With Ace leading them to who knows where. But they didn't dare offend him and silently followed since it was too late to turn around now.

In Ace's 'guidance' they all travel for who knows how long because they weren't any concept of day and night, but Ace was closely calculating the time because of every four hours' rest. 

'Five days pass, but we still didn't encounter a single golem or another living being, are we lost?!' Ace's heart sank to rock bottom because this wasn't a good sign for him.

While Ace was getting desperate, the others were also pessimistic about the situation. Although only five days passed in this gloomy and poisonous environment, it was like five months has passed.