What is "transmogrification", basically all it is allowing and item to transfer the appearance to another item with "great looks", this in destiny will allow more variations and more options for guardians to express their unique style. Guardians wont have to be bound to a certain gear just because the stats are good, they will be able to look good and be "Bad-ass" here will be a link for what is "transmogrification in more detail. http://dictionary.reference.com/browse/transmogrification