1: download a model of the item you want to use. For this post, I'm going to assume I'm using MC!'s Sobi Mask model. 2: Import the model into your map. 3: Open you Object Editor, and go to the Abilities Section. For this example, I'd go to the ability associated with the Sobi Mask. 4: Change the Art-Target section( this should be blank) to your imported model. 5: change it to wherever it would attach, e.g. 'head'\'hand'-'left'\etc.
To make it more clear aboute import you only have to save the map and then you can use the attachment/icon.
if it shuld be on a item then edit a itemability like ring of protecktion. to make it more realistic add like a scroll of haste to you item (if its a light item)