Well Allen after resting sometime already begins to advance once again and after 1 hour later he already reaches the main area higher most likely he will find the Boss monster.
Until now he could only sense a little aura coming out from that place so he wasn't sure if it was from the Boss monster or not but at the same time after coming to the place he could naturally see the sign that showed him that it was the place of the Boss monster.
He was roaming around in that place so he did not get attacked by any Monster at that time and also even though he could feel other Monsters were also present in that place but those Monsters did not do anything and most likely waited for someone or something. He was very familiar with the situation. Every time when a Boss monster appears on the Dungeon naturally something like that happens and also previously when he fights the Boss monster something like that naturally happens at that time.