New deep dark dimension with new boss

There is a warden already so why not unlock a new craft recipe after defeating it like a ancient lighter. It lights the portal and you are brang to a world like the over world but night and everything is dark blueish and there are villages with blue villagers in it and the iron golem is a weeker version of the warden. There could be new ores and in the dimension and you unlock the recipes after entering the portal. These ores should be like the over worlds ores but older and stronger. And there should be a casel with a king version of the Worden that is has a new take and more health but is slower and the long range atake is less damaging because it has not fought in thousands of years. After its defeat it could drop a non-craftable item that is enchanted and is crown.