Stormblood may not be Final Fantasy 14's best expansion, but it sure as hell is the cheapest right now. Square Enix is currently giving away the MMO's second major expansion for free, though there's a small caveat.
If you're somebody making use of the game's rather generous free trial—the one that contains the base game plus the excellent first expansion Heavensward—you won't be able to claim it. You'll need to have the base game and a paying subscription in order to take advantage of the deal. On the bright side, it's yours to keep forever.
