The legends of the Green Man date back to medieval England.  The existence of the Green Man date back to even further than that.  The Green Man is a humanoid entity that is more of a nymph who was conjured by witches when they wanted to perform nature magic.  He has a very powerful casting ability as he was born out of the energies of nature in primordial times, to guard the sacred oaks, which is a magical forest on the plane of Tylwyth Teg.  He has the ability of casting any kind of nature magic, because he is the embodiment of all of nature.  He knows all of nature and holds all of its energies within.  This piece summons his presence and calls upon him to cast elemental magic on your behalf.  When you are wearing this piece, all you have to do is write down what you want the Green Man to do for you, the light it on fire and allow it to burn, emanating your intention into the atmosphere.  The Greem Man will be able to read your request and will cast it for you.  You can cast any kind of spell that you want to cast and you are able to cast as many spells as you'd like.