[Vertigo]

Hello to everyone. I know this is kind of inappropriate, as i should start with a thread in the "Introduce Yourself" section, but i won't be a regular member that's why i'm starting here.

Needless to say that, I love horror movies and especially the non-colored! There's magic surrounding most of those (at least to my eyes).

Anyway the reason i'm writing this, is cause i need your help and knowledge! I'm searching for this movie for 11 years now, but the lack of information i have hasn't given me any results.
The movie is not colored (if i remember right) and it was about a group of young people that wanted to scare some of their friends and decided to make a prank. So they built a monster and when they came to this house they scared 'em but soon enough a real zombie came there from a lake. And this zombie was somehow connected to a necklace a girl wore and was driven by it's magic power. The movie ended (if again my memory does not fail me) with a message and a guy reading an anouncement of some kind that this "zombie was a prisoner that was chained".

Any suggestions?
Thanks in advance!