This is a very short description, because the entity that is held within is very powerful and there isn't much to be had in the way of telling you about him. The power that he gives you is a very well-defined power. There is no ambiguity about it. You are not asking for powers and it will not allow you to create anything you want. Rather, it affords you one power and it does it very well.
Among the ranks of Hell are the admirals and generals of the Devil. There are many, but none quite as sneaky as Ornias. Ornias the Great Marquis of Hell and the rule over 30 legions of lost souls. He knows and he teaches the virtues of the stars and the mansions of the planets. He is one of the few that have seen the likes of the Old Heaven, before the thwarted takeover attempt. He fell with Satan and has lived in Hell ever since.
He has been able to master the powers of the Zodiac and of Alchemy, which is how he will give you this power. He is an expert in the metamorphoses and thus when you wear this piece, you will be able to form-shift into whatever form you want to take. There are no holds barred for this piece and it will literally allow you to transform into whatever you want to transform into. Whether you want to become a vampire or a bird, or a werewolf, or a witch. You will be able to take the form of whatever, as well as gain all the knowledge and magic that is associated with whatever form you choose to take. See, I told you. Simple-- but VERY POWERFUL!!
UPATE: WE HAVE BEEN DOING TESTING ON THIS PIECE, AND THIS WHY WE REFRAIN FROM ADDING ANYTHING ON RIGHT AWAY. AFTER ADDITIONAL TESTING, AFTER THIS ITEM HAD ALREADY BEEN WRITTEN UP, WE WERE ABLE TO DETERMINE THE FOLLOWING. NOT ONLY DOES THIS PIECE ALLOW YOU TO FORM SHIFT; IT GIVES YOU THE POWERS OF ORNIAS' ALCHEMY, WHICH MEANS YOU CAN BASICALLY CREATE ANY TYPE OF MAGIC THAT YOU WANT. THIS IS DONE, BECAUSE HE KNOWS ALL OF THE POWERS THAT THE ZODIAC HAS TO OFFER AND ALL YOU HAVE TO DO IS STATE THE MAGIC YOU WANT TO CREATE IN A SPOKEN THOUGHT FORM AND IT WILL COME TO LIFE. THIS PIECE ALSO BRINGS YOU ALL THE KNOWLEDGE OF THE ZODIAC AND THE ANCIENT STAR GATES AND TIME GATES THAT WILL OPEN UP WHEN YOU USE THIS PIECE TO ALLOW YOU TO TRAVEL TO ANYWHERE IN EXISTENCE, JUST IN ASTRAL FORM. IT WILL ALSO ALLOW YOU TO TRAVEL ANYWHERE IN TIME, AGAIN IN ASTRAL FROM. YOU CAN DO THIS IN ANY FORM YOU CHOOSE TO TAKE, BECAUSE AGAIN, THIS PIECE GIVES YOU FULL FORM SHIFTING POWERS.
THE PIECE ITSELF HOLDS MEDALLIONS THAT REPRESENT EACH SIGN OF THE ZODIAC AND OF THE STAR GATES THAT EACH ONE REPRESENTS AND THE BRACELET IS MADE OF SOLID SILVER!! IT'S IMPORTANT TO REMEMBER THAT THIS PIECE *DOES NOT* CONJURE A DEMON, BUT RATHER EXTRACTS A DUPLICATE FORM OF DUAL POWERS THAT ARE INDENTICAL TO WHAT HE HAS TO OFFER!! SO, IT'S NOT EVIL IN ANY WAY SHAPE OR FORM.