Tasty mead is brewed in the brewery and later quaffed by the soldiers during their celebrations.
These drinks make your soldiers braver and stronger when attacking others (1% per level). Unfortunately the chiefs’ power of persuasion is decreased by 50% and catapults can only do random hits.
It can only be built in the capital but affects the whole empire.
The level dependent attributes (such as construction costs and generated culture points) can be found here.
For the full table of construction times click this link for server with 1x speed and this link for server with 3x speed.