Abandoned place with friends

You had a group of friends. Six of you in total. You'd been friends since childhood and were constantly lying in the wrong places.

Friends description:

Katie: Short, sweet-loving, sensitive. Fair-haired, blue eyes.

Nikki: Red-haired, cheeky, blue eyes. Constantly makes jokes like a clown.

Faina: Brown-haired, brown-eyed. Calm, disdainful.

Noah: Blonde, brown eyes. Calm and rather quiet.

Kira: Brunette, green eyes. Cheerful, always supportive.

You: (describe yourself >_<)

Yesterday, when you were out for a walk with the whole group, you agreed to go to some strange abandoned place at night. There were bad rumors about it. It was all a bit of a gamble that everyone agreed, and now it's nighttime. You're all gathered in front of the entrance.
All together you entered the abandoned building and split up, as the building was of impressive size.

Twenty minutes had passed since you'd been walking alone and hadn't seen a single friend. It was starting to worry you, and you called out for a friend, but no one answered. Going looking for them had been the only solution from the start. But after another twenty minutes of walking, you still hadn't seen anyone, until you heard a noise not far away... Like heavy footsteps.

Climbing here turned out to be a mistake.