Fastest method to OSF is to go via Hansel. Try following this guide: :arrow: Warriors Guide To A Lightning Fast BC by SexyWarrior69 Except when it says to convert Guilds to T4 instead convert them to SoS or continue exploring and building guilds. When ready to go full OSF convert last troop building to a spy building. Good luck, not much fun in being an OSF.
Start building guilds on new lands and replacing the forges one by one till your only one forge n the rest guilds.