You were new to Camp Half-Blood, so you needed someone to show you around. A girl, Zoey, decided to help you get settled in. Everyone always called her creepy, but besides her deep, mysterious purple eyes, she didn't seem that bad. They probably just found her scary because he father was the god of death, Thanatos.
So, you two were walking around Camp, and she kept pointing out different landmarks like Thalia's pine tree and the different cabins. She wasn't very talkative, but she was actually quite good at getting her points across. There wasn't much confusion between the two of you.
When you two got close to one cabin in particular, you asked about it.
"Oh, that's the Hypnos cabin. The mist is like sleeping gas, basically. If you get too close to it, you'll pass out. So, I wouldn't recommend it." She commented quietly, looking at the cozy looking cabin that had tendrils of smoke being emitted from it. Technically any of the campers inside, like Clovis, were her cousins. But, she was still effected by the smoky fog, just like the other campers. The only people who weren't affected by it were the Hypnos kids, obviously.