Add unlockables

As the title says add unlockables to the game , like with adventure mode in DS - you had to complete adventure mode to get Maxwell and Wes . It will give the player a clear goal .
For example begin able to unlock a character or even a skin . if you beat the Ancient Fuelweaver without useing the console (disable the unlockables if the console is used in the server) .

Another suggestion I have is add a story progression , for example - you kill the Ancient Fuelweaver and put the key in the portal = the portal works non-stop and new monsters and resources start to appear in the world (cave/surface) even transform some biomes to others , this will give a clear goal to the player and will filter out the new/inexperienced players because they won't be able to kill the Ancient Fuelweaver .

After having said that I have to make it clear that I don't know if it is even possible for DST engine to do this ... but it's a good idea on how to add new content and give the player a goal while keeping the sandbox feel to it .