What's gonna happen here is one of 2 things. 1) you break your game and it crashes for reasons unknown and beyond our understanding or 2) you have 2 exotics equipped. I've heard people try the full inventory-eidolon ally upgrade before, but not like this. Here's my thought process: Note: this will take an f-ton of grinding. 1) have full exotic primary inventory, eidolon ally equipped. 2) equip a legendary heavy 3) have a full secondary exotic inventory, your equipped weapon included (for example 10 ice breakers, 1 equipped) 4) have a full vault and postmaster. These can be full of blues and lost blues if packages are too tedious 5) upgrade eidolon ally to Necrochasm. So as we know it cannot now a) equip another secondary that is non exotic or lack a secondary altogether AND b) cannot equip a non exotic primary or lack a primary altogether. It can't send a spare from either category to the postmaster or vault as well (at this point, your equipped heavy is irrelevant). Wtf will happen? Will we ever know? Will we have a heavy as a primary? Will we have 2 exotics active? Will we break our console? Will we crash bungie's servers forever? Discuss. EDIT: perhaps locking all the items discussed would prevent them from being deleted when sent to a full postmaster