It may well be that “collaboration is the new IBU” in the beer world as noted by @jeffbearer on Twitter, but this is one brewer collaboration that’s worth getting excited about: Sierra Nevada teaming up with Dogfish Head to produce something, well, amazing:

This fall independent craft brewers Sierra Nevada and Dogfish Head, will release two collaborative beers. Limb & Life—a draft-only beer—will debut in October; with Life & Limb 24oz bottles and limited draft to follow in November.

Life & Limb is a 10% ABV strong beer that defies style characteristics—brewed with pure maple syrup from the Calagione family farm in Massachusetts and estate barley grown on the Grossman “farm” at the brewery in Chico. The beer is alive with yeast—a blend of both breweries’ house strains—bottle conditioned for added complexity and shelf life, and naturally carbonated with birch syrup fresh from Alaska; it is the first beer we know of ever to use birch syrup in the brew. If stored under good conditions, this rich, full-bodied beer should age well for years. Life & Limb will be available in 24-oz. bottles and limited draft starting this November.

Limb & Life is a companion to the big beer—an acorn off the larger tree. It is a 5% ABV small beer-a low-gravity beer made using the residual sugar as “second runnings” from the first larger brew, fortified with American hops. This is a session beer. Its big brother is a sipper. Limb & Life will be a limited draft-only product, a prelude to the bigger beer, available in select bars and restaurants this October.

10% alcohol, pure maple syrup, blended house yeasts, carbonated with birch syrup. Wow.