Guild seasons are one of the most unique systems in Albion Online. Player guilds battle for glory and rewards depending on how well your guild does within a season.
Season 12 will begin tomorrow Saturday March 13th. A full schedule for season 12 can be found here.
Amongst the rewards this season is an avatar, an avatar ring and a Juggernaut mount.

Season 12 will also bring about a few changes from previous seasons, a full list can be found here.
If you are new to Albion Online or need a refresher on how season works, Youtuber Lewpac has released a overview that can be seen below.