Dream About Fighting Monster In Theater

This dream was about

I walked into a theater with my mum and gran. As I walked in, a girl . I did not know. Put her arm around my shoulder and asked if I wanted to be friends. There was a bunch of other kids my age there. What I thought we were training for a war. The girl got sent away for a test and I followed her on a beach into a field where I saw her having to fight a shadowy big monster. I ran away because I was scared that I was next. In the middle of the night, I woke up and I heard the monster coming up the stairs. I ran to my dad's room to wake him up and he just lay there and did nothing. Then my friend came into the room and the monster walked into the room and my friend got really scared. It was a tall, slim figure with no face and I thought I was going to have to fight him. Then he sat down in the bed and started talking and I woke up.