Doctrin
These cards give you another asymmetry, which is particularly evident in Phase I. Your armies gain a special ability in the worker placement bidding competition, which is either offensive, defensive or more economically oriented. In addition, doctrines provide you with game materials free of charge each cycle. While all other players draw one at random, Strategos has a (limited) choice here.
Doctrines primarily increase asymmetry in warfare. They offer each player a passive ability and an active effect. This active effect is considered ‘anytime’ and therefore functions like ‘anytime’ cards.