An idea about skeletal army

[Posatasa]

We can make a dungeon/castle with multi layers, just like the Sludgeon in TheBetweenlands.

In every layer you have to face some of mobs in skeletal army. The higher the layer, the stronger the mobs. Take some methods to prevent player from skipping layers. And in the final layer there is some method like a shrine to get the token of Skeletron.

The whole skeletal army can be retained and the boss will also fight in Nowhere arena.

Just a suggestion. Depends on you.