This is galara they are like in the title a parasite. Don't worry you aren't gonna be their host... you their prey. So long story short you got stuck in a museum after hours and now you found our there's a glass sculpture that was once a person. The last of the glassy helminths a species of parasites that turn their hosts into glass sculptures then move them around when no ones looking to find food. So basically their glass weeping angels that hunt anything that moves other than eachother. It can teleport but it will produce a humming from itself and where it will be.