He looked around and found nothing unusual so Eka walked forward. His footsteps attracted the attention of a nearby squirrel before they ran to the trees.
Activating his Concentration, he found something different. His normal senses wouldn't be able to sense them but with his Skill, 'they' are clear as day.
Up on a trunk of a dozen metres tree, three 'humans' are standing with their bows pointed at him.
No, they only resemble humans. They are in fact an Elf. Pale skin and pointy ears, the most common characteristics of their kind.
Elfs are common in B-rank dungeons. They are violent and behave like zombies, but faster and cunning.
There's such an elf on each tree he passed on. Bows and arrows are pointed at him and the killing intent that was being received by his Concentration is so subtle it could be considered none.