A beer brewed with a ridiculous amount of pureed raspberries (over a ton of 'em!). Fort has a Belgian-style base, then they follow a similar fermentation process to the one they use on their other super-high ABV brews, 120 Minute IPA and World Wide Stout.
Due to its high ABV, Fort is an excellent candidate for cellaring. Grab a few bottles, enjoy one now and lay the others down for a few years. Want to know when the Fort you find was bottled? Check the 'Bottled On' date on the neck of each bottle.