By drinking this swirling concoction you gain the ability to summon forth any and all masks known throughout all of creation. Whether real or fictional.
*When you summon and wear a mask you gain any and all powers, skills and abilities associated to the mask and/or its original wearer. For example wearing Batman's mask will make you a world class martial artist and detective. Jason Voorhees' mask will make you a near unstoppable revenant, etc.
*The mask only grants you the powers of the original wearers and not items or equipment. Unless the wearer can summon the equipment at will. Example, Batman's mask will not grant you gadgets instead the knowledge and intelligence to make them. A Fate Servants mask will allow you to use and summon Noble Phantasms.
*You will also gain any weaknesses associated with the masks and individuals as well. Specific elements, items, etc.
*However any form of possession or corruption associated with a mask will not effect you. Example, Majora's Mask or the Terror Mask will grant you full power from them but won't be able to possess or corrupt you. You will be in control.
*Any special conditions a mask requires will no longer be needed such as a specific time, place, ritual, etc.
*Any mask summoned must be a mask as in it covers the face in some way. For example a hat is not a mask unless a veil or cloth covers the face, so Sherlock Holmes' hat is not valid. A full face helmet counts such as a knights helmet or the Dr. Fate's/Nabu's Helmet of Fate.
*You may summon as many masks as you like but you can only wear one at a time, unless you take a form with multiple head and/or faces.
*If you wish you may lend a mask out to another and grant them its abilities. You may unsummon a mask at any time.