This item it's not working it supposed to makes you look like someone else.
Explanation: you only have to be in front of someone target it and use the potion, after that, you should look like the player that you have select. (This is a potion from Alchemy's profession.
Link: http://db.pandawow.me?item=58489/potion-of-illusion
Photo Example: http://www.db.pandawow.me?item=58489/potion-of-illusion#screenshots:id=207684
PD: I don't know a lot of english so i tried to explain it the best way i can.
Thank you so much i hope you read this.