Because he was alone now, Theo rushed toward the Great Arsin Forest. He only needed to consider his stamina instead of everyone's stamina, speed, and other stuff. Hence, he managed to reach the Great Arsin Forest in four days from the expected six days.
The mission he got from the Star Group would require him to travel for another three days in the same direction, which was one of the reasons why he chose this mission instead of any other.
The Great Arsin Forest was incomparably vast. It was hard to find a temple that was shorter than the trees in the area. On the contrary, the people who entered were greeted by numerous monsters.
Some monsters were poisonous that forced the people to dodge. Some monsters who nimbly moved around the trees restrained their movements.